Can anyone identify these heads?

I don't think those are actual EngineQuest heads, if that is your question. These are probably the Chinese replacement heads, and they are definitely for Magnum engines as others have stated. If these are the version I think they are, others have mentioned them before, saying the castings are quite rough inside the ports.
You'd likely be money and horsepower ahead ordering properly prepped and assembled EQ heads from someone like IMM.
If you do buy these, post some pics so we can see them.