As far as I can tell, this same question has been asked before
[here](https://japanese.stackexchange.com/questions/73622/what-is-the-right-
pronunciation-
of-%e4%bd%95%e3%81%ab%e3%81%bf%e3%81%88%e3%81%be%e3%81%99%e3%81%8b).

However, I am asking it nonetheless because I've noticed that the Genki
textbook uses both readings and I find the inconsistency weird on their part
if the difference is only a matter of formality.

So, can anybody confirm that both readings are the same? Is there no usage
difference besides formality?

I also ask because I've found [this
article](https://penzemi.com/%E3%80%8C%E4%BD%95%E3%81%AB%E3%80%8D%E3%81%AE%E8%AA%AD%E3%81%BF%E6%96%B9/)
that seems to discuss the difference, but I cannot understand it.
CC BY-SA 4.0
2020-04-11T15:40:51.723
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2020-04-11T15:40:51.723
35229
question
kanji
Is 「何に」 read 「なにに」or 「なんに」?