Shimano XT BB-MT800-PA | 89.5/92mm
Use: MTB 
Model: BB-MT800-PA
BB-Type: Press Fit (41x24mm)
Press-Fit BB shell width: 89.5/92mm
Shell diameter: 41mm
Compatibility
XT FC-M8000
XT FC-T8000
SLX FC-M7000
FC-MT700
FC-MT600

Shimano BB-MT801
Use: MTB 
Model: BB-MT801 / BB-MT801-K
BB-Type: HOLLOWTECH II
Threaded: BSA
Shell diameter: BSA (BC 1.37)
Mounting: Threaded (for chain case)
Threaded BB shell width (choose variant)
68/73mm (BB-MT801)
68/73mm for Chain Case (BB-MT801-K)
Compatibility
XT FC-M8100 / FC-M8120 / FC-M8130 / FC-M8000 / FC-T8000
SLX FC-M7100 / FC-M7120 / FC-M7130 / FC-M7000
FC-MT700
FC-MT610
FC-MT600