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correct rev matching is the same in auto as it is for a manual
regarding the TQ (torque converter) free spinning by depressurizing. This is a bit above my head, it may be possible to depressurize the TQ but i would expect it would be increadibly hard and possibly dangerous for the TQ.
Having said that i have noticed once or twice that if i am in drive and say traveling at 60 kph then turn off the TQ lock up the engine will only take as much petrol as if i was in neutral. This indicates that if the wheel side of the TQ is spinning faster than the engine side then it will not back power the engine when the TQ is unlocked.
Note: I have not checked this so it may not be too accurate you may need to check with your own car.
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