If you've installed in the same folder: no...or more exactly, just one file (but it is an important one) should still be there, the one names 'Systems.xml' which contains all your system (emulator) settings!
It should be located in "mGalaxy\Data\Systems.xml"
The "similar" v6.0 file is called "UserSystems.xml" and is located in "mGalaxy\Data\UserSystems\UserSystems.xml"