Different states have different laws. You can't legally swap vins, but you can re-vin in some cases
"The bill allows kit cars and replica vehicles to be assigned a certificate of title bearing the same model year designation the body of the vehicle most closely resembles. Additional, but not identical legislation has been introduced in the New Jersey Senate in the form of S.B. 687."
SEMA SAN - SEMA ACTION NETWORK
and here for the list of states and regs
SEMA SAN - SEMA ACTION NETWORK
So, if you build up a 911 from parts and bean cans to make it look like a factory RSR, I suppose you can get an RSR title in some states (with a fresh state issued vin)
Note: this usually involves some verification of receipts and checking of component serial numbers to make sure parts were legally obtained.