Can you create different tiers of users for the Pro-sites plug?

We have two sets of users on our system, [1] cleints [2] agencies, each of which we would like to apply a different set of levels in pro-sites. Is that possible? We realize we can add all the levels in one instance of pro-sites across our multi-site but we are hoping to show [1] users a different set of upgrade options than our agency users?