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It's still the same planetary gearset. One change the old TCU might not like is the replacement of the brake band with a clutch - the timing of engagement/disengagement might be different. It will work, but might not shift smoothly.
Another change is a new sensor in the tranny on the output shaft of torque converter. With this sensor the TCU can see the difference between torque converter slippage and clutch slippage. This enables learning function in the new TCU - it can adapt to the clutch wear. The old one will obviously work without this new sensor, but who knows how the calibration of accumulator springs and throttle body passages has changed - they now should have some room for TCU control of shift timing.
It will shift, but you might not like the sensations.
Re connecting the new TCM to the old ECU - it might be a bit more challenging, apparently they communicate a sophisticated stuff (like atomspheric pressure) between themselves. Here we go reverse engineering serial protocols and programming single chip controllers.
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