None that I'm aware of using Neo Power Kit. NPK only has a limited save and restore feature for roms that save to the SRAM on the cart (even that doesn't work all the time) -- such as gba roms.
If you are using magic key 3, it's likely saving to the mk3 2MB save buffer instead (flashcart isn't used at all for saving nds roms). Unless you are using the menu software, you can't back this save up, and therefore can't flash a new save, either.
BruceG