Sure there are...hotbarrel said:
AMD-65 as original (with barrel extension)
AMD-65 with standard AK buttstock
AMD-65 with underfolder (can't use forward pistol grip)
AMD-65 with krink-type sidefolder
AMD-65 with AR buttstock
AMD-65 with AR telescoping buttstock
AMD-65 with regular AK handguards and original folding buttstock
AMD-65 with regular AK handguards and any of the above mentioned buttstocks
That'll give you about 14 different variants. If you figure in laminate, blonde, walnut, Chinese red, plum polymer, black polymer, or green polymer furniture, that will leave you with about 42 total variations. Then there's the choices for muzzle extension... I saw a pic of some flash hiders (or faux hiders) that were probably long enough to work for attaining legal length.
Then there would be the AMD-74 (AMD-65 chambered in 5.45) or a .223 version...