I think I have both and have tried a lot of things over the years, but it seems that despite the similarities, ME patients seem to have more post exertional malaise, and POIS sufferers have more cognitive and psychiatric symptoms. I believe these conditions have didferent causes and mechanisms. That's just my opinion though.
I don't know what exactly do you mean by ME specific treatmenta, but I have tried Mestinon, LDN, coq10 and more, and probably many more, but no real effect on POIS. Coq10 has a huge effect on energy, but I cannot tolerate it.