>>102923842.0 started with the Advent of Decay Kickstarter. Originally they were just going to be all female parts, but people complained so the 4h shoehorned males on the buck.
Most figures still use the 1.0 build, and pretty much every new part added since AoD has been 1.0 based. 2.0 bodies are really only used on females and goblins.
And the best way to tell the difference is the torso and limbs. 1.0s have solid single piece bodies where 2.0s have an ab swivel mid chest. 2.0s are also much more slender. Even the 2.0 skeletons are skinny compared to the original 1.0 beefboned Skeletons.
And completely unrelated, but these two just showed up. Probably the fastest turnaround time on order to ship I've seen from these guys. Probably won't bust em open any time soon though as my desk is kind of...full...but it's nice having them in hand.