Better make sure they're transferrable. Just because they look the same, doesn't make them the same. Best to be sure. If the part numbers are the same, it should be a drop-in fit. If you're getting it new, look up Tamiya online, and they have instructions on assembly and installation for certain models, so you're covered. Going by their instruction is the best. If the instructions for either model isn't there (but it should be - the Manta ray is now called the DF01), the MO5 diff instruction will help, as MO5 diffs are the same type.

Good luck!