Yes they should fit. As to whether they work, that is another question. Some PSL's will run just about any mag out there. Others are finicky. All you can do is try them out and see. Mine seem to work best with brass cased ammo. Others will handle the various bimetallic casings without any problems. Use 150 grain bullets. No heavier as this may damage the rifle just like heavier rounds can damage a Garand. I purchased 6 mags and wound up tossing the shells of two of them. Kept the innards. One would not lock in place. The other just would not feed properly no matter what I did.
When a PSL is made in Romania, 4 mags are custom fitted to the rifle. These are shipped with the rifle and even carry the serial number of the rifle that they were fitted to . When they reach the US the distributors remove all the mags and toss them into a big barrel or whatever. Then they just pick two at random and ship them with the rifle. The others are sold separately.