Campus total is the maximum number of members each sorority can have. It's also sometimes referred to as "ceiling."
Quota is - without getting too detailed - the number of women rushing divided by the number of sororities. Since DePaul has 6 sororities, that means 198 women went through rush last year. Every sorority is entitled to take quota even if they are over campus total.
This is REALLY oversimplifying it but I don't want to make your head explode.
And yeah, every group does kind of come across the same on websites. That's what recruitment is for - to meet everyone in person.