I wouldn't. You're looking to cause yourself problems. Not to mention adding more tinkered with cameras to the eventual resale pool. I've said over and over, Hasselblads are not a camera for do it yourselfers. There's just too much you don't know and wouldn't suspect that are actually extremely important. the op is not asking about backs. He is asking about switching body shells.
Here is a section from the manual. Notice the say bend to make adjustments. Doesn't sound like a finely tuned mechanism to me. As we say in the copier repair business "you bend you break, you form you fix".
Adjustment of the release mechanism
Check that the release bar (30375) is free from the
signal arm pawl. Adjust by carefully bending the
forward part of the signal arm. Use tool V-2200.
Minimum free play: 0.2 mm.
With the camera fully cocked the release bar should
protrude a maximum of 0.9 mm through the rear plate.
Adjust this by bending the release arm (13357) using
tool V-2224.
Fig. 35.
The mirror function should be checked and possibly
adjusted before proceeding to adjust the release
mechanism.
The mirror should be locked by the mirror catch lever
(13356-1). Movement can be increased or reduced by
adjusting the mirror actuating lever (13362).
Adjustment is carried out by holding the arm fixed
using tool V-2205 and gently bend the forward part of
the arm using tool V-2201. Bend downwards for
increased mirror movement.
Note! The inner side cover (22813) must be removed
before an adjustment can be made.
The mirror’s overtravel should be min. 1 mm. Lubricate
the mirror cam (22355) with grease.