Why get anal-retentive about a 0.01 turn difference in a gear ratio? It's obvious that both gearsets exist in Eaton third members. For whatever reason, GM used both tooth counts at various times.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!