DSA - Are they the "same"?

comsSame.rb

def comp(array1, array2)
  return false if array1.nil? || array2.nil?

  hash1 = {}
  hash2 = {}
  
  array1.each do |a|
    hash1[a] = hash1[a].nil? ? 1 : hash1[a] + 1
  end
  array2.each do |a|
    hash2[a] = hash2[a].nil? ? 1 : hash2[a] + 1
  end
  
  hash1.each do |key, value|
    return false unless hash2[key ** 2] == value
  end
  
  true
end