I hope so too. I will say that I can hear the difference between Bulkhead and Roadblock, but Panthro does sound just like Bulkhead (aside from the dialogue spoken) when they're speaking normally.

QED. :)

I don't know why people expect every voice actor to have a thousand voices. Only a handful of them can do that... not everyone's Mel Blanc.

A lot of them do have a wide range and they only just get typecast. Kevin Michael Richardson gets pegged as "big tough (often black or non-human) guy" when he's a great impressionist and has 10 or more distinctive voices outside of that.

The emphasis is on the acting. If you don't mind that a physical actor has the same face in every film, you shouldn't despair on a vocal one having the same voice.