Yes, I would never make that shift without matching revs, it'd be an horrific thing to inflict on the gearbox.
If you're braking hard in the RWD car, it's also liable to cause the rear wheels to lose traction and lock up, which is not a good thing. Been there, done that, felt the elevated heart rate...
@Brommers started
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Yes, I would never make that shift without matching revs, it'd be an horrific thing to inflict on the gearbox.