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I was the one who ran the ecu's back to back. First redtop MT and then greytop AT. It confirmed 3 things:
1. The greytop and redtop ecu pinouts and sensors are the same
2. There is no major performance difference just from the ecu's
3. Beams automatic tranny ecus can be used in place of manual tranny ecu's without issue, error code, or check engine light.
There was a guy who recently got a swap set with a blown redtop. He replaced with a greytop and hasn't said anything about being slower. Though he only drove the redtop for 40 miles.
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