[Zubersoft]

Long press the song on the library screen, tap Share->Export as .msf, and then select the destination for the .msf file. If you choose the thumb drive, you can then transfer the thumb drive to the other tablet, then use Import->Local File in MobileSheets to select the .msf file. You can export multiple songs in this fashion, or entire Setlists (the option is Export->Share songs and files when exporting a setlist).

Mike