It looks like the only difference gear ratio wise between the MM6 and the MG9 are the overdrive (5th and 6th) gear ratios. Otherwise 1st-4th gears are the same ratios between the two transmissions.
MM6 (1LE)
1st 2.66
2nd 1.78
3rd 1.30
4th 1.00
5th 0.74
6th 0.50
MG9 (ZL1 & Z28)
1st 2.66
2nd 1.78
3rd 1.30
4th 1.00
5th 0.85
6th 0.67
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