Probably best to ask Caterpillar.
IIRC exhaust gas is in the 700F range, and cooling
water could be 140F-170F depending on fresh or salt water
choice. So the 165 might be adequate, while the 200 might also be normal considering more exhaust gas in the mix means temps higher than just the water
You could also take an infrared non-contact thermometer to read what your "normal" temps are in that location, now. Or a simple oven
temperature/clock/timer, the kind that has a stainless probe, which could be strapped into the same location and read from time to time to see how it normally is.
The question is not which is "right" but rather, what is normal in that spot, in your installation