The one on the right is older.
I'd keep it.
Is the trigger guard plastic on the newer one? It looks like it.
The only thing I'd do is swap the mag tube extensions as I prefer the flush look to the protruding.
It's hard to tell but it might also be that the newer one has a longer barrel and the extensions are the same length?
Great info thanks.....trigger guard plastic on newer on....and mag extension tube longer on older one....which I don't like either....love the flush fit.....and yes barrel on the older on is about a half inch shorter crazy all stuff I didn't notice great info Thanks