There is a certain poetic sense in which “I see” works. “I see him last night in my dreams” although not technically correct. However, generally speaking “I saw” is the right usage for past events. Much prose writing in English novels is in the present tense although they are about past events. The author superimposes himself however on the situation as if it were the present.

You are correct that both are understandable.

The only other possible everyday meaning I could think of would be ‘I see him [in my mind’s eye] last night’; that is, I am, at this very moment, imagining him last night. But it should almost always be clear from context which one is intended.

‘Correct’ doesn’t mean ‘understandable’, though. If I say ‘Me want have fooding’ it’s pretty clear what to understand from that, but it’s not anywhere near correct Standard English grammar. If you lived somewhere where you spoke a dialect of English in which this was acceptable grammar, however, then it would be correct for that dialect.

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I saw him last night is correct but i think both has the same meaning and are understandable.

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