I have two males. One I bought neutered and the other I just got neutered this morning. Could my already neutered one attack the other? The doctors used a safe glue tye agent to stop the bleeding and let it heal. Could my bought neutered male attack the other for having a wound?

I'm not sure if this will answer your question, but as I recall, I was told to leave my newly neutered male in our hospital cage, separate from his colony, for one week to heal. No wheel either.
I don't recall if they specifically said they were worried his cage mates would bother his wound, but I assume that's why.

When I got my first male neutered, I was told to keep him separate for a week, but after 5 days I put him back with his cage mate, no problems. He never even acted like he noticed his surgery. When I got my second male neutered I only kept him separate one night.