There seems to be a lot of fluidity about the exact words of the grace after meals (birkat hamazon) at the time of this Gemara. The themes are outlined but the exact words are still in flux.
In the second blessing, the covenant and the Torah are mentioned. Pelimo says the “covenant” is mentioned before “Torah” because the word “covenant” (brit) appears 13 times in the circumcision of Abraham, (Gen. 17:1-14) while “Torah” is given with only 3 instances of “covenant.” That is to say, there are three instances of communal acceptance of “Torah:” Sinai (Ex. 24:7), Mt. Gerezim (Deut. 28:69) and the Plains of Moab (Deut. 29:11).
The Covenantal relationship with G-d is communally accepted, but the personal is more intense.