Compatible derailleur?

[Scoobs222]

I have a crossfire and a crossfuse electric bike, I'm not very technical on bikes but I have a spare shimano slx m7000 10 speed rear derailleur, would they be compatible with any of my bikes? And would it be worth changing it over from the stock one?

 

[Nealh]

Not really unless they are 10 spd as well.