There are 2 brothers named Jean Baptiste Riel in this family, one born in 1705 and the other in 1709, both baptisms found for them. One of them married Louise Marguerite Frappier.
Tanguay has the one born in 1705 marrying her, but is missing the one born in 1709 from his list. Jetté says it is the one born in 1709 who married her, and has both brothers listed.
Normally, a child did not get the same name as a sibling unless that sibling was already dead or unless the godparent of same gender was named the same (seen one family with 3 sibs of same name due to this). This last case does not apply to these boys, both godfathers have the name Pierre and not Jean Baptiste.
The funeral record for the husband of Louise Frappier is no help, the age given at death fits neither boy, in fact is large over-estimation by the priest, putting either one before even the marriage of parents.
The other brother is https://www.wikitree.com/wiki/Riel-54 and has the wife attached.
He is currently listed as born in 1705. I believe this to be an error and that the boy born in 1705 died young, and he should be listed as born in 1709.