This is interesting stuff.
I've had discussions about this with people recently, as I had read that monitors "create more heat" by the metabolism increases associated with feeding.
The protein changes that occur when an egg is developing (outside of the snake) also create heat, and I've always wondered about the eggs inside the snake also creating heat, since there are also protein changes happening.
Saying reptiles are cold blooded, makes many people think they don't create any heat. Certain life processes do create heat, reptiles can create heat, they are just not able to thermoregulate in the same way as mammals (or to produce enough heat to do so).
Energy in, should equal energy out. What isn't put into growth goes somewhere.
If you come accross more information like this, feel free to pass it along, I love to read this stuff.