Trebor, they share the same exact magazines as the Cz-83 in .380 caliber. The only thing I noticed was the 9mm mak rounds take up a tad more space than the .380s, so a ten round magazine only holds 9 9x18s, and the 13 rounders hold 12.
The other difference is in the barrel. Not only is the barrel a tad larger to accomodate the 9x18 ammo, the Makarov CZ-83 barrel has polygonal rifling. The thing looks as if it is smooth bore, and it cleans up really easily.
The cz83's sights are much easier to see than the PM; the magazine has the new style button release behind the trigger on both sides of the stock. The safety is also ambidextrous. CZ83s are da/sa with no decocker. Speaking of the triggers, they are very nice right out of the box. And they age very well. I have a 1988-built surplus cz83 .380 which has the sweetest trigger I've ever used.
Plastic grip panels have gentle thumb rests on each side and are comfortable righty or lefty (I'm left handed).
There is a dealer with a link here called "CZ Connection" in Georgia who also sells these mak cz83s. If Empire says he has them, then he does. The supply is limited, so don't wait forever.
Any more questions, just ask. I own CZ83 and Bulgarian PM.