SQL CE 4 TO 3.5

Hello, sorry for my bad english:

I have an app that runs in 32-bit OS that create a SQL CE 3.5 database to load the DB in a PDA. But my client have to run the app on a 64-bit OS so i updated the sql ce to 4. But i found that SQL Server Compact 4.0 does not have a release for Windows Mobile. So i wanted to know if sql ce 4 can create a sql ce 3.5 DB or if i can copy my data from the db 4 to 3.5?

Thank you.