So what you are looking at is the difference stocks (grips to you who don't care to be pedantic) can make in how a gun fits your hand. You can pretty much replace one set for another as long as they are both designed for the handgun in question.
Get yourself to a gun shop or a gun show and look at different grips on the same gun frame. There are more than just the 2 you posted pictures of, and if you luck out the person selling them will take the time to show you what they have in stock and let you try different grips on the gun you say you are looking to buy. Changing grips usually involves one screw, either in the middle of the panel or on the heel (bottom). Using gunsmithing screwdrivers that fit the slot properly prevents cosmetic scratches - this is not a case where "chicks dig scars" id what you are trying for.