The FLU unit used a different PCB connector for the LCD ribbon than the BLU models. I don't think they even used the same LCD controller chip.
It's probably not possible to use a NLU LCD with a GP32 PCB from a BLU unit, seeing as the NLU was earlier than the FLU.
I suppose you could hack around with the ribbon cable...but, no, too much work/too tricky/may not be the same ribbon pinout anyway.