GEOPAK SS3 backward compatibility with GEOPAK SS2

We are starting a new project and would like to use GEOPAK SS3 V081109493 because of the ProjectWise Integration with the .GPK file.  We will need to deliver all data to our Client who is using SS2 and state that SS2 is to be used.  Is SS3 and SS2 completely compatitble and If we do the project in SS3 and deliver all of the data will our Client have any issues with these deliverables.

Thank you,

Bob Hanson