So many dragunovs.
There aren't any "SVD" Dragunovs of Soviet design pictured.
The rifles might be Romanian PSLs (or copies thereof) which is a completely different rifle.
Parts and magazines are not interchangeable.
Sometimes the PSL is referred to as a "FPK" Dragunov, but it is easy to get the two confused.
The PSL (top) has no gap between the trigger guard and the magazine, while the Dragunov (bottom) does have space.