Re:
Comp, Race and Champ were essentially "unranged" groups.
You can judge the level of technology by looking at the double chainsets or the RDs of the time, see the spare parts that correspond across the ranges and draw your conclusions from there.
Broadly, Comp was Centaur / Chorus-level, Race was Veloce level and Champ was entry level ... but they don't align exactly with specific groups.
Campagnolo have used the "Comp" moniker a few times, in different applications and it doesn't always refer to product at the same level - so the OverTorque crankset made in 2012/14, in two variations, Comp One and Comp Ultra, was a Chorus level component at Comp One and a Record (arguably, Super-Record) level component at Comp Ultra level ...