Same group. Different specie. Anaxyrus americanus ________ fill in the blank. They're all the American Toad.
Hybridizing can also confuse identification especially near the theoretical boundaries of each specie within the group.
For instance here on my compound I have A. americanus americanus/A. americanus fowleri hybrids.
The point with regard to their diet is that all the Toad species within the Anaxyrus group can eat the same arthropods from arachnids to ants to moths to slugs etc. etc. and the more varied their diet the better.

Presently at the compound it's Cranefly season and my Grays are loving them. Toads of the Anaxyrus americanus group can also eat Craneflies for those who have access to them and wish to enhance their toad's diet. Toads of the Anaxyrus americanus group will most defintely eat Craneflies in the wild as these insects spend a great deal of time on the ground.