compatibility

Hi guys, Bought a new bike recently(2013ish 3x10 drivetrain) and needed to get a new pair of brakes as they were seized. Grabbed the Shimano xt m8000 front brakes but didn't realise the shifters were not compatible. I've got Shimano m780 I spec A shifters and am trying to figure out what my...

My girlfriend has a Trek Fuel Ex 8 2017 with an XT 2x11 and I have a Giant Fathem 1 2018 with an SLX 1x11. For those bikes we would both prefer the other drive train. I want the 2x11 for my hardtail and she would love the 1x11 for her trail bike. My question is is it possible to do a drive...