Not positive but I believe the smaller one is a Champion model CW1. 3 cylinder, 1.5 - 3HP.
In my opinion, those small Champion pumps were some of the best. Sadly, Champion sold out to Gardner-Denver a few years ago and they promptly shut down production of these models.
Not forgivable.
The larger one is also a Champion, it looks like a 15HP model, look on the motor nameplate. Good unit.