sentence construction - "Have you ever seen anyone walk (walking) the streets like that?"

Have you ever seen anyone walk the streets like that?

Have you ever seen anyone walking the streets like that?

Are both the above sentences grammatically correct? Do they mean the same?

I saw him kiss her the other day.

I saw him kissing her the other day.

Are both the above sentences grammatically correct? Do they mean the same?

And I'm sorry, if the latter two sentences come off immature .-. I couldn't come up with better sentences.