TestSystem3.cs

using UnityEngine;
using Unity.Entities;
using Unity.Jobs;

public class TestSystem3 : JobComponentSystem
{
    protected override JobHandle OnUpdate(JobHandle inputDeps)
    {
        return new Process().ScheduleSingle(this, inputDeps);
    }

    struct Process : IJobProcessComponentData<SampleData3>
    {
        public void Execute(ref SampleData3 data)
        {
            Debug.Log("sample3");
        }
    }
}

TestSystem4.cs

using UnityEngine;
using Unity.Entities;
using Unity.Jobs;

public class TestSystem4 : JobComponentSystem
{
    protected override JobHandle OnUpdate(JobHandle inputDeps)
    {
        return new Process().ScheduleSingle(this, inputDeps);
    }

    struct Process : IJobProcessComponentData<SampleData3>
    {
        public void Execute(ref SampleData3 data)
        {
            Debug.Log("sample4");
        }
    }
}