Value Object vs Entity

Address.cs

    public class Address : ValueObject
    {
        public string Street { get; init; }
        public string ZipCode { get; init; }
        public string Municipality { get; init; }

        public string AddressLine1 => $"{Street}";
        public string AddressLine2 => $"{Country.Code}-{ZipCode} {Municipality}";

        /// <summary>
        /// Entity Framework Core Constructor
        /// </summary>
        private Address() { }
        public Address(string street, string zipCode, string municipalityName)
        {
            Street = street;
            ZipCode = zipCode;
            Municipality = municipalityName;
        }
        public Address Copy()
        {
            return new Address(Street, ZipCode, Municipality, Country);
        }
        protected override IEnumerable<object> GetAtomicValues()
        {
            yield return Street.ToUpper();
            yield return ZipCode.ToUpper();
            yield return Municipality.ToUpper();
        }
    }

Entity.cs

public abstract class Entity
    {
        /// <summary>
        /// Gets or sets the unique identifier.
        /// </summary>
        public int Id { get; protected set; }
        /// <summary>
        /// Gets or sets the created DateTime.
        /// </summary>
        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
        /// <summary>
        /// Gets or sets the updated DateTime.
        /// </summary>
        public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;

        public override bool Equals(object obj)
        {
            var other = obj as Entity;
            // Check if the other is null.
            if (other is null)
                return false;

            // Check if the objects refer to the same alloc. in memory.
            if (ReferenceEquals(this, other))
                return true;

            // Check if the types of the objects are the same.
            if (GetType() != other.GetType())
                return false;

            // Check if the objects are transient(new).
            // Meaning we can not really compare these 2 entities, since the Id was not yet set.
            if (Id == 0 || other.Id == 0)
                return false;

            // Compare Id's.
            return Id == other.Id;
        }

        public static bool operator ==(Entity a, Entity b)
        {
            // Both Entities are null, so they're the same.
            if (a is null && b is null)
                return true;

            // One if them is null which means we cannot compare.
            if (a is null || b is null)
                return false;

            return a.Equals(b);
        }
        public static bool operator !=(Entity a, Entity b)
        {
            return !(a == b);
        }
        public override int GetHashCode()
        {
            // The type and identifier are the "Unique makers"
            return (GetType().ToString() + Id).GetHashCode();
        }

        public override string ToString()
        {
            return $"{GetType().Name} - {Id}";
        }
    }

ValueObject.cs

public abstract class ValueObject
    {
        protected static bool EqualOperator(ValueObject left, ValueObject right)
        {
            if (left is null ^ right is null)
                return false;

            return left is null || left.Equals(right);
        }

        protected static bool NotEqualOperator(ValueObject left, ValueObject right)
        {
            return !(EqualOperator(left, right));
        }

        protected abstract IEnumerable<object> GetAtomicValues();

        public override bool Equals(object obj)
        {
            if (obj == null || obj.GetType() != GetType())
            {
                return false;
            }

            ValueObject other = (ValueObject)obj;
            IEnumerator<object> thisValues = GetAtomicValues().GetEnumerator();
            IEnumerator<object> otherValues = other.GetAtomicValues().GetEnumerator();
            while (thisValues.MoveNext() && otherValues.MoveNext())
            {
                if (thisValues.Current is null ^ otherValues.Current is null)
                    return false;

                if (thisValues.Current != null && !thisValues.Current.Equals(otherValues.Current))
                    return false;
            }
            return !thisValues.MoveNext() && !otherValues.MoveNext();
        }

        public override int GetHashCode()
        {
            return GetAtomicValues()
             .Select(x => x != null ? x.GetHashCode() : 0)
             .Aggregate((x, y) => x ^ y);
        }
        public static bool operator !=(ValueObject a, ValueObject b)
        {
            return !(a == b);
        }
        public static bool operator ==(ValueObject a, ValueObject b)
        {
            if (a is null && b is null)
                return true;

            if (a is null || b is null)
                return false;

            return a.Equals(b);
        }
    }