If there's more to it, then please expand the question.
I just wonder is there possible collision in hash sha256 or in hash RMD160?
Oh I see, then the answer is there's little to no chance of collision.
There's a possibility, yes because 2^160 (
the "pubKeyhash") is still a finite number but still too large to have a reasonable chance of collision happening in our lifetime.
Take note those hashes are not exclusive to Bitcoin of cryptocurrencies so if ever there's a legitimate collision happened in the past,
It would've been in the news by now.