Look at the cast date numbers on the back of each & pick the one type closest to 72 MY & your car's production month/yr on the VIN, & also verify that all 4 are 914-xxxx part nos. back there too.
If the back has an inset cast or cut into them, then they were the later xxxx-01 part no. for 73 MY 914s with the then new hub-centric hubs up front.
Being an early production 72, they would've used 71 production of the wheels up to Dec 71 & maybe even into early 72.
Either way you have a couple of partial or 1/2 sets, & you'll need to sell 1-2 & source 2 of the correct casting style & numbers, if you want them correct for your car &/or are a CW c orrectness type.
If you're not picky & it's for a DD, then you could put a matching pair on each side, & few people would notice the difference.
Good Luck!
Tom
///////