This really belongs in the "Firearms & Knives: Other Brands and General Topics", but to answer your question:
Externally, it is almost identical in size to a S&W K-frame, but I think the top strap is a little thicker, more like the current production Model 19 and 66. Parts do not interchange, the lock work is completely different than that of the S&W K-frame. The main spring is not a leaf spring, but is a coil spring, so it will never have the trigger action like you can get with a S&W. If you want speed loaders, use those designed for S&W K-frame 38 Special/357 Magnum, the same goes for holsters.