Not sure how much help this will be but this was the list of what was changed from the B44 to the B44.1. I think the motor mount changed as well but don't know if the mounting to the chassis was different.
2.5mm updated carbon fiber chassis for LiPo batteries only (no cell slots) #9774
Carbon fiber LiPo battery tray with removable center section (*optional ballast weight req'd) #9775
3.5 mm thick front shock tower (from 3mm) #9703
Updated front top deck for more durability along with new antenna location #9701
Cam motor mount set #9800
Factory Team 0 degree aluminum rear hubs #9864
Factory Team V2 dual-cap hard anodized shock bodies with threaded collars Fronts: #7475, Rears: #7478
V2 slipper assembly with high-rate spring #7485, 7486, 9736
Factory Team Gold slipper pads #9603
Rear anti-roll bar included #9708
Bleed-screw shock caps #6443
Carbon-fiber battery straps #9786
Servo mounted 3mm closer to centerline
Chassis cut for additional ground clearance
Spur gear changed from 84 to 81 #9651
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