I believe the PM Md90 with the pushbutton, left offset sidefolders were for domestic Romanian military.
Though over time I think they exported and produced both types as they transition into more NATO ready arms.
The receiver selector markings would reveal more but they are not present in the kits
There have been a lot of the Md90 kits dated 91 and 92 lately. They often show light use.
Previously there were a number of early dated well used Romanian kit imports. 1960"s and 70's dated trunnions., in Md63 or 65.
Nice looking kits you received.