They're totally different designs. This is readily apparent if you handle both. The only things they share are the same cartridge, similar actions, and vaguely similar appearance. The CZ-82 isn't a "clone" of the Mak any more than a SIG P226 is a "clone" of a S&W Model 39.
As RamSlammer says, the CZ-82 (technically CZ vz-82, but I'll let it slide...) is a substantially heavier and bulkier gun with a double-stack magazine.
Makarovs are more expensive for a couple of reasons.
First, they're not being imported anymore. Genuine C&R-eligible military Makarovs are actually somewhat rare. The lion's share of Makarovs advertised on GB and elsewhere were made for the commercial market and are not C&R, despite lots of 'Net misinformation regarding this fact. (Real military Maks never had adjustable sights and never came in .380ACP.)
Second, although the Mak obviously wasn't designed for CCW by American civilians, it's a naturally great gun for CCW due to its thin profile, light weight, toughness, and lack of sharp edges and corners. It takes to CCW like a duck to water.
This has prompted many owners to hang onto theirs, cutting supply further and driving prices up. OTOH the CZ-82, with its greater thickness, heavier weight, and numerous sharp corners, isn't quite as good of a CCW piece.