I don't believe that Ukraine ever made any wood parts as they did not make any AK rifles. Ukraine unlike Bulgaria had a large supply of Russian made military weapons having seen many military Makarov being exported from there as well as photos of definitively Russian AKMs.
It has always been my suspicion that these stocks, always referred to as Ukrainian/estonian were truly made in Russia by a contractor, probably not in the business of making weapons, to make parts for replacement. These parts as well as their AKM versions seem to be made to nearly the same specs, as far as materials go. A properly refinished replacement AKM set will be indistinguishable from a Russian take off. The low comb is not a result of being re-arsenaled, nearly every on that i have seen is like that. The only other thing I have noticed is that the workmanship in the machining of the wood suffers as there are a lot of roughly finished surfaces in the stock grooves and other spots as though the material was gouged away at a faster speed or by a different end mill. Would have been solved by better sanding.
Curiously, the finish on that top example image looks military to me, and that is something I've never seen before on such a stock