Anyone know if the grip frames are the same on the various NAA revolvers? I've been looking at a couple of the "larger" models (Black Widow and Earl) as a pocket plinker. I like the sights on the former, but hate the look of the oversized rubber grip. I saw in another post, where someone had replaced the grips with what appeared to be the standard birdshead grip. The grips on the Earl look more proportionate to the gun, but still give something to hold on to. Are these, by any chance, interchangeable? Or is there a square butt frame under the mini hogleg grips?