The beavertail fitting is nice, and they are similar, but you can see that a little more care was taken with the TGO-1 with the blending at the top. These photo's where taken with the GS depressed. you can also see how the GS (where the web of your hand goes) is blended with the frame.
I added a magwell to the Loaded, but the TGO-1 and Trophy Match had them as standard parts. You can see the difference in the blending and what a drop-in magwell would look like.