What's different between なんの and どこの

what's different between
どこの , どこ
なんの ,なん
どこの means the same thing as どの.

Where did you see なんの?

As for なん,the only thing I can think of for that is its use at the end of a nominalized sentence that ends in a na-adjective or a noun. For example:
誰かがフォーラムで質問をするたびに文脈は重要な勘案なんです。
or
誰かがフォーラムで質問をするたびに文脈は重要な勘案なのです。
 
The OP would be talking about the n-euphonic change of なに, as in なんで, なんと, なんか, なんて...

@ the OP, see #3 in the page linked below.
の - Wiktionary
 
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