The Endor Rebel's what most are calling a running variation. The definition of variation is dependant upon who you're talking to though.
Sometimes what some call a variant is an error, etc... It can get confusing.
Hasbro produced 50% of the Endor Rebel as the bearded (Tom Green) figure at first, and these shipped fairly early into the Saga range of figures (I recall spotting them in October I believe it was, but I believe they shipped in September initially?)
The other 50% of the Endor Rebel's production run was this new figure who is clean shaven, and blonde. I'm not sure when I first saw him off hand now... I'm thinking prior to X-Mas I saw one maybe.
At first, this figure was rough to find for many, and some predicted it would be the most difficult to find. It likely will be a LITTLE tougher than the bearded chap, as it's a little less "distinct" of an army builder.
I would not personally list the beardless soldier as "rare" because I've seen him well over 20 times now. He's even a pegwarmer in some instances, and if Hasbro's being honest then he's equally produced to what the bearded soldier is...
That would make him no more rare at all.
He's a better looking figure I think, though that figure still irks me because it's so unposeable.
I feel the Endor REbel 4-pack should've been the POTF2 body with these 2 heads instead of the original generic head. Oh well...
A good custom (for you wanting variety) is to put the Saga body on the legs/lower torso of a POTF2 troop. It works fairly well with a little finegaling.
Now if only the arms posed at the shoulder more, it would be pretty sweet.