It is weird, I was just thinking about this today
AOTC:
training jumpsuit adult clone troopers
normal Geonosian, ala Sun Fac with a new head
ROTS:
Jedi Padawan 2 packs, ready to be slaughtered
ESB:
new Ugnaughts with junk trays
Bespin guards, Asian and blacks
Dagobah pilot Luke (the changes are so minor to most, but it is critical to me)