Yes, the side folding stocks are interchangeable as the attachment bracket is the same as the standard stock. The "Under Folding Stock" is the no no without extensive modification on the WASR-10 Brian.

The Wassenaar Arrangement Semiautomatic Rifle is a semi-automatic version of the Romanian military Pistol Mitralier model 1963/1965, better known here in the US as the "Romy G". Made by Cugir Factory and Imported and modified by Century International Arms to conform with 922(r) the WASR is an inexpensive, durable, reliable and customizable Kalishnikov series rifle, and the GP WASR 10 is perfect for the beginner or AK-47 purist.
Specifications and Features:
Romanian GP WASR-10
Stamped receiver
7.62x39 caliber
16.25" barrel
Chrome lined
1:10" twist
Legendary AKM reliability
30 round removable box magazine
Military style wood stock and handguard
Black polymer pistol grip
Slant brake
Bayonet lug
Side receiver scope mount
34.25" overall length
7.5 lbs

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Brian, Yes the stocks are interchangeable.