By definition and having entered the plastic state some degree of permanent deformation has already been imparted. In spite of this we have from screw experience the fact of that we reuse damaged items, many times out of mere inconvenience of getting some new substitutes. We also know that to redrive a damaged screw in wood is a much more likely successful affair than to redrive a damaged bolt-nut pair.
Obviously, the ordinary way to detension (and only if you plan to reuse) the bolts is to turn loose the nut, with everything it implies for a yielded bolt. Hence to drive again to the wanted state may be at best feasible, but no one would call this a standard installation. You may try anyway for what would be a more uniform setup of the pretension, since, anyway, if non-existent you have found the structure to meet what required. I unfortunately am not an expert of bolt technology and must not give advice on what would depend on geometry of the engagement, the level of force, the chemistry etc. Since you do not lose but a present unruly situation for another, and both look mechanically acceptable to you, you might decide more than anything to see the feasibility of loosing the nut, then put it back again, satisfying technical curiosity and always learning something. If I would be in such mindset I would try to learn from the experts on bolts what to expect. If not available or not caring, likely would accept the present state of affairs, you know there's something not as well as it should be, but at least stays "controlled" and "clean". After touching the nuts we might not have these niceties.