I'm looking at Glock G22.4-G22.3 LE trade ins. But, I need to know something about the grips on the Gen 3 VS Gen 4. From what I have read, the Gen 4 comes factory with no palm swell. Is the Gen 3 grip the same width as the stock/factory Gen 4 (finger grooves to the rear,heel)? Or, is it thicker, vise versa?