Yup... Just rename the G6 .0 save file to .sav. Open up m3 game manager and choose the game on your m3 that you want to import the G6 sav too. Double click the game name and a save manager will pop up. Click the .dat saver file name and choose "write .sav" under general format. Browse to the G6 .sav file you want to use and choose it. Voila!
Hope that helps!