I just finished "fixing" my Disney exclusive Droid Factory 4pk as the new styled legs are not screen accurate (to prevent having to find left/right pairs in the sorting bins - a big problem with the old release, the new legs do not have the detailing on the shoulder nor do they possess the wires on the front of the feet). I cannot do anything about the shoulder details as my sculpting skills are not sufficient to do very tiny, fine details like that yet, but I could certainly take care of the missing foot wires.
I lucked out and had a spare pair of old white/black detailed legs and swapped out the new, incorrect legs on the R0 droid (leftmost in pic) and added foot wires scavenged from spare Astromech feet from my fodder box to the remaining 3 droids.
I got lucky again as I had just enough feet to fix all of the incorrect legs - but all of the feet were right feet so I had to boil and bend the rigid plastic wires on half of them to go the opposite direction
Before:
After:
