Hilariously, I was just watching that last night.

I'm not really down for exact lookalike, since I've always found that a little too PB/Actor convenient (for me, no judgement on other's loves), but I wouldn't mind if like Luna thought there was a resemblance (in his facial features, etc) from a distance while looking quickly across a crowd in a room even though on closer appearance he definitely didn't look like Barty Crouch Jr when looking at him straight on (as well as of because demeanor, dress, the hair, etc).