No, they each are 3 different characters who work together, Fujiko is Lupin's perpetual love interest who exploits him to get what she wants, and the inspector is forever doomed to chase them.
Hahaha oh...cuz i was watching the Miyazaki movie and was constantly confused trying to figure out if they were all the same, because they do look similar

EDIT: Are you sure they arent the same person....like the only thing different between them is their posture and expression