If I’m not mistaken, each Wii has its own individual console ID that is used when compiling customs into .bin files. The customs you have already compiled were done so using the old console ID (in the ng_id.txt file), and would therefore be incompatible with the new Wii’s different ID. As far as I know, there’s no way to change Wii console IDs, so you might need to recompile each folder individually with the new ID.