Just wanted to chime in myself and state that the files produced from my RPi2 binaries are completely portable with other binary distributions of the BottleCaps wallet. Though if you have followed previously mentioned steps to self-compile, you are probably running with bdb5.x (in which case your blockchain and wallet files are NOT compatible)
Wallet is upgradeable with the
db_upgrade wallet.dat command though. db_upgrade came bundled with the Berkeley DB I use on my Linux system (Arch based).