Here is More Tales of the City's Paul Hopkins and Billy Campbell. (Having seen Campbell in SFC's Helix, he seems hardly to have aged a day!)
I'm sorry Paul Hopkins's career hasn't taken off the way Billy Campbell's did. I think people unfairly compare him to Marcus D'Amico's "Mouse", and denigrate Hopkins as the "Darrin Stevens" of the Tales mini-series. Frankly, I thought Hopkins was better in the role, and terrific in Mambo Italiano.
Yes, it was just a walk-on in Mambo. That's the problem with much of his later career. He's an excellent actor and still good looking, but hasn't gotten any leading parts. That's what bugs me about Hopkins: He's clearly capable of doing far more.