The 1860 Army and the 1862 (or 60, or 61 ;-))New Model Small .36 looked very similar, I doubt if many parts would interchange, though- maybe the loading levers. The Army was built on the 51 Navy frame, but had a bigger handle (or grip), the 1862 was built on the smaller "pocket pistol" frame and either had the smaller navy-size handle or an even smaller one (I'm unsure).