Or you could try get an original from a friend and do a side by side comparison. that also is sometimes tricky, but there should be some difference between the threads, thickness of tube, quality of steel and engraving, as well as types of 510 pin and screws used.
But frankly bro, this is a question you should have ask before the trade, now that you already traded, just try it, then if you like the result, well and good.