The length has been corrected to 47mm in the latest BOM. It is actually 47mm +/-1mm as steppers have poor tolerance for that dimension due to it being determined by a stack of laminations pressed together.
Shorter motors will need mechanical changes:
The holes for the Z brackets would need to be lower and the lead screws longer.
The X motor bracket would change as it now has a screw in the back of the motor.
The brackets to attach the D connector to the extruder and the ribbon cable to the X motor are fixed by removing the original motor screws and replacing them with longer ones. Those screw lengths would need to change.
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