The factory bulbs has the 12v35w/35w P43T on them. Can't remember the name right off, but it wasn't Bobcat. It would seem reasonable that all 12v double 35watt bulbs with a P43T base would have the same heat output. I am not saying they do, just seems reasonable. We will see what happens.
I do have one of those Harbor Freight temperature guns, I'll check the old against the new when they come in and report back. I actually don't use my lights enough to warrant putting bulbs in but just like to keep things working.