A pellet grill, unlike a gas grill, has a single source of heat/a single burn pot. Most pellet grills have a centrally located burn pot. However, there are models where the burn pot is located on either the left of the right side of the cooking chamber.

Therefore, directly over the burn pot is where the 'hot spot' of the pellet grill will be. However, the extent of the difference in temperature across the grate depends on the specific pellet grill.

For instance, there will typically be a heat deflector over the pellet burn pot. The thickness of the heat deflector does vary, with some models using thin steel all the way up to other models using a thick cast-iron heat deflector.

Furthermore, the thickness of the grease tray/drip pan will also dictate the heat distribution across the grates. You also have some models with direct-flame access/flame broiler.

Obviously, the location of the flame broiler function will be directly over the burn pot. In some cases, even when closed, directly over that flame broiler is going to be notably hotter than other areas of the grates.