User's to access multiple encrypted network shares

I'm using Symantec Encryption Server (Version 3.3.2 MP6) and Symantec Encryption Desktop (Version 10.3.2 MP6) on the clients (all Win 7 x64)

I have two groups of users (drawn in via LDAP AD), one group needs accees to one encrypted folder and the other group needs access to a separate encrypted folder, but also needs access to the first folder as well.

If I've set the groups up with their own group key, and their own policy, Will the second group be able to read the first encrypted folder? Or will it be encrypted with the first groups key? If so, what would be the best way to solve this issue?

I'd appreciate any help or advice