That Isaac Berlin stock design and carving is certainly close.
The signed gun by Andres Albrect shown on Pg. 62 of Whiskers book "Gunsmiths of Lancaster County Pa., is a close example as well.
I would think the Albrect rifle would have more in common with the Ferree, as those guys were about the same age and working about the same time, whereas Berlin was some 20 years younger.
However, given the time period they worked, all three of these guys were working early on when designs and styles were still developing.
John