I seem to recall reading that you can't run a 68LC040 + 68882 combination.

I also seem to recall reading that when running a 68020 + 68881 or 68030 + 68882 that the clock speeds of the FPUs can differ from the ALU. (I also recall something about multiple 6888{1,2}'s per 680{2,3}0, with appropriate glue on the bus...)

So maybe it's a 25MHz FPU for the LC/LCII/LCIII?