But the individual nucleotides contain carbon and could thus be rearranged by carbokinesis, though to actually end up with a differing ratio of nucleotides you'd have to be getting them from somewhere else. So psychometabolism works better.How exactly is it related to carbokinesis? DNA is a complex molecule that really doesn't have very much carbon in it all. At any rate DNA manipulation might be closer to advanced Psychometabolism. Also if this power did exist it would make DNA Identification useless for some people. Not that that last one is particularly important. I might have to say on the whole that becoming a clone anyone as long as you know their DNA might be a little OP. The problem of course is that DNA doesn't quite work that way. If you made any drastic changes the body would shut down for lack of compatibility with the new strand. After all DNA is the instruction book for the body's chemistry set. Thus we arrive at the power being nearly useless and incredibly dangerous.
As for cloning someone you would have to know their full genetic code, which you couldn't use your power to figure out since pk doesn't work in other peoples bodies. You'd also have to know exactly which parts of your own genetic code control your own abilities and possibly your brain as well or risk being stuck as a clone.
As for incompatibilities or whatnot the ability, by my theory, instantly rewrites the genetic make-up of all cells simultaneously and lets the regenerative factor sort out the rest. As long as you aren't trying to change your species or something ultra drastic the healing factor should compensate for most health problems resulting from minor incompatibilities.
As an afterthought DNA identification could still identify you by the section of your DNA that dictates your power, and also possibly your brain, since you wouldn't want to alter either of those.