Easy answer....

DON’T

G1 is G1. But as Kelvin can’t understand, there aren’t 2 Barrages in G1 that need splitting into eras, there are just 2 transformers with the same name. One is an insecticon, one is a micro master. They align themselves with that simple piece of additional knowledge. Same for the constructions. Original, European yellow, European yellow non-combining, G2. It has nothing to do with eras.

So what’s happening in his school? Many kids likely have the same name, and split up with surnames as a simple piece of additional knowledge. Extra Info made from classes.

Matthew and Matthew. (Oh no same name)
Matthew smith and Matthew smith (well that didn’t work)
Matthew smith grade 1, Matthew smith grade 6. (Oh my god thank Jesus we didn’t have to divide the school.)