Said number squared.
They are anagrams of each other.
lemon and melon
With English spelling, Tokyo and Kyoto are anagrams. (With romanized Japanese however, they are not: Tookyoo and Kyooto)
Polo and pool are anagrams of each other.
Japan (Tokyo / Kyoto)
An anagram is a word made from all the letters of a given word, the subject word, using each letter the same number of times as in the subject word. This is different from the many questions on WA asking how many words can be made from a given word. Answers contain different numbers of letters. Anagrams can be phrases or even sentences, depending on the number and variety of letters in the subject word. Anagrammatists strive to find not only anagrams, but anagrams that reflect on the subject in some often humorous way. George Bush: He bugs Gore.
They have a different number of neutrons.
The number of protons is different.
They will have a different number of neutrons.
The number of neutrons is different.
Two different words with the same letters, like vein and vane is called a homonym. Another homonym is formed by the words great and grate.
Gametes contain different genetic information to each other and to the parent cell.