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Heya!
I've got a good few bolts on here, including some of the MG3 Heavy bolts and I had a few questions regarding all of it. So the identifier on the heavy bolt heads is H20, I know that, but seemingly they aren't any different than regular MG3 bolt heads. But my question is, for one, what are these heavy bolts worth, are they okay to put a regular MG3 bolt head on the heavy bolt carrier, and if I do that, how does it affect performance and value for the assembly?

The difference between bolts is the weight of the bolt body. I've not seen any variation of the bolt heads. Medium and heavy bolts are used to reduce the rate of fire, and must be used with the appropriate matching bolt buffer, which is usually harder to find that the bolts.