Switching from Paid Memberships Pro To WMPU Dev Memberships Pro


I am writing because I am strongly considering a major overhaul for my site. During this switch, I'm thinking that I'm going to move to a WPMU Dev supported theme and use mainly WPMU Dev plugins so that I get great support from you guys. However, I already have Paid Memberships Pro on my website and would like to transfer those members without an issue to the WPMU Dev Memberships plugin. Is there a way to accomplish this without collecting their credit card information again?

Thanks for the help!