Can't try because I don't own a Powersaves. I don't think so. The Sky3DS+ still emulate the cartridge when it received some electricity lol, and everything is read from the microSD, that's why I doubt.
Anyways, now we can copy-paste the .sav file from the microSD but I don't know if it is useful. We can also just use SaveData Manager using Ninjhax/Browserhax/OOT3DHax/otherhax.