NDKoze There is no question you are correct, they can sometimes taste different because of differences in the cook cycle. We don’t have an exact scientific answer for you but this is what we believe. With Patties generally you are cooking faster at a higher temperature and that tends to draw more moisture out, that can do two things. First, it is going to bring more salt to the surface of the meat so you will get more salt with the initial bite, which is what your mouth immediately registers and sticks with you more. Second, the more moisture you remove from the patty the strong the remaining salt taste is going to be.
Let us know if anyone has a differing opinion.