What is the contribution of 「とか」 to the meaning of the sentence? And what is the meaning of construction 「違ってくる」?
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「とか」 functions to give a single (or primary) example of what is being talked about. Here that example is the 「読み方」 ("readings" or "pronunciations" of the same kanji).
「読み方とか」, therefore, means "things such as readings/pronunciations".
Roughly speaking, 「とか」 is the colloquial and informal version of 「など」.
「違ってくる」 is a common verb phrase meaning "to come/result in a variety of patterns/styles".
For those wondering what the 「の」 is doing there in 「違ってくるの」, it is a nominalizer. It nominalizes the verb phrase 「違ってくる」 to use it as the grammatical subject of the sentence. The topic marker 「って」 or 「は」 is left unsaid after the 「違ってくるの」 as this is 100% colloquial/informal speech to begin with.
"With even the same kanji, things such as pronunciations come in a wide variety of patterns, which is really amazing, isn't it?"