In the fight that Sarutobi died in, it was said that he could've beaten him or been a better match if he was 10 years younger or something along those lines.

The Kyubi incident and the time that Orochimaru ran away is 10+ years ago.

Orochimaru not knowing who Naruto is, means nothing considering Naruto would've been a baby when Orochimaru had left, and the question is relevant.

Can you look at someone's baby picture and know it was them today? No, you can't.
Hence why Orochimaru didn't recognize Naruto, but found out who he is.