They should just mark the tires so you can tell at a glance. It's great fodder for the commentators to go on about the different tire choices each team made.
FE uses only one type of tire and it’s the same tire for everyone. They are probably closest to, but distinct from, the Inter tires used in damp conditions in F1.
They do. Pirelli F1 tires are color coded so anyone can tell at a glance what compound it is. Not sure why FE is different.