both will act the same, run hot and get water in the oil, but a warped head will usually leak into a cylinder maybe 2, one next to the other usually the two middle ones, best way is to run a compression check to see what side of engine has the bad head, some times you can find the problem by just looking at the plugs, if the plug is snow white or deep tan with a lot of burnt material on one , thats the cylinder to check, water leaking into a cylinder will make the plug white and carbon free