The point is that it all depends on the circumstances. Temps will vary, voltages required will vary, and achievable overclocks will vary. You can do some research and maybe get a general idea, but the only way to find out is to do it.
I am running my 930 at 4.1 with idle temps in the low 30s with full load temps around 46 to 50 so you might imagine that your 2500k will run a bit higher clock and cooler. I have the 240 kit so the 360 will be better.