It doesn't seem to me that installing different fans would cause a Thermal Runaway problem. But... I can tell you I always relax Marlin's thermal runaway parameters.

I'm not comfortable fighting what the experts have decided as 'safe'. But I can tell you the people (experts!!!!!) that did the thermal runaway code in Marlin think the parameters should and need to be set very tight. These are people that wake up in a cold sweat in the middle of the night. They really care about this stuff. And they don't want anybody's house to burn down because they didn't detect a thermal runaway. Me??? I'm willing to put my printer somewhere it can't start a fire and I have lots of smoke detectors over it and strategically placed around the house. I feel comfortable relaxing the parameters so I don't have false triggers.