I have a similar condition on La Vita Dolce, a 1986 Cheoy Lee 40 with Lehman 135s. Apparently there wasn't a 2 to 1 left hand trans available when she was built, so the diffrrence was made up on the prop. My Port engine has a 1.91 to 1 ratio.
PO had contacted the factory about yhis when he bought the boat, and their response letter is still with her papers.
It does, however make the synchronizer off a bit, as mine reads off the shafts.
Cheoy Lee 40 LRC