Unless you can find a "before and after" owner of an SA-14, the best person/people to ask would be the TRL guys. Paul or Brian would honestly be able to tell you, in detail, what the differences will be.
They don't really have anything to gain by telling you. They Don't manufacture the machines (obviously) - so one more mod isn't going to make, or break them. You'll find them to be, honest, ethical, and professional all the way.
I have no connection with TRL, other than, I am one happy customer. :-)
Best
paul