The WASR-10s are purpose-made sporter rifles from Romania. They come in country with the PSL-style stock, narrow mag well, muzzle nut tacked on, and the ears shaved off the bayonet lug. It's here that Century opens-up the magwell and puts normal Romanian stock and the needed 922(r) compliance parts.
IIRC, the WASR-10/63 rifles are actually made from surplus, demilled md. 63 rifles, I think they're put together here as they do have the threaded muzzle/slant brake and intact bayonet lugs. Basically, if you care about the bayonet lug, get a 10/63. Otherwise, grab a double-stack WASR-10 (one can buy then in single or double stack) and carefully file off the tack weld on the underside of the muzzle nut/FSB.
Both still have chrome-lined hammer-forged barrels and both lack the magazine well dimples.