He's not going to eat the bass if they are actually that size. Some people aren't very good at estimating size though so I don't wanna get your fish eaten by saying "Yeah, go ahead and put them in together", lol.
He may be aggressive towards the bass though. It depends on your greens personality. He also may TRY to eat it even though he can't get it all the way down, in which case he could still injure or kill it.