Bio, you actually have several choices on these rifles, as the two rifles aren't one in the same.
Besides the lock, you can choose between the finale on the patchbox. RCA shows it with wire and nails going up the wrist, and in Patricks book it has a little brass inlay instead.
On the cheek piece side, the main carving design isn't exactly the same. In RCA the two scrolls and leaf leading up the the upper corner of the butt plate have little 'buds' between them, but in Patricks book, there's none.
In RCA the carving ahead of the cheek piece goes almost all the way up the wrist to just short of the beavertail. In Patricks book, this carving bit is an inch or so shorter in length. Plus the cheek piece itself is not exactly the same.
In RCA the trigger guard has the hump at the forward end of the bow, and in Patricks book the hump is missing.
Probably a few other differences as well, and no doubt the two guns were made by the same hand, so pick out what you like the best!
John