Numbers are digital and very precise. Word spellings can be altered without changing the meaning of a word. But numbers or number groups cannot be altered without changing what the number stands for. Changing the vowel component of a word does not change the number equivalent; but any change in the consonant component of a word changes its number equivalent.
The implication of this is that when converting numbers to words, we have to be precise about the spelling we have in mind. The ABZZ number equivalent of a word depends strictly on the letters that form the word and not the sound of the word. It is important to remember which spelling you have used when words having the same meaning can be spelt in different ways e.g. jail/gaol, hiccough/hiccup, cosy/cozy, Odesa/Odessa, enrol/enroll. It may be important in some cases to be clear whether you are using British spellings or American spellings.
The words polarize and polarise have the same meaning but they are spelt differently by the Americans and the British. If you spell the word polarize, the number-code equivalent would be 9500; but if spelt as polarise, the number-code equivalent changes to 9506.