If you don't want bugs with FIFA 13 db for FIFA 11..
1. Open FIFA 13 database with DBM 11...Extract: players, players names, teams, leagues,playersteamlinks,teamleagueslinks,formatio ns,formupdate,teamkits...
2. Open FIFA 11 database with DBM 11...Extract the same txt files...
3. Open the txt files (ex FIFA 11's players and FIFA 13's players)with Microsoft Excel...Delete from FIFA 13 db the new settings and copy-paste from FIFA 11 db the settings which missing..
4. Import the edited files in FIFA 11's database...
5. Open the edited FIFA 11 database with CM 11...Create CMP with all the leagues...(new cmp after 4 or 5 leagues)...
6. Open the default FIFA 11 database with CM 11... Load the cmp and DON'T REPLACE any player...Check their ids and if the import id is different with patch id change it to used patch id... It 's important to check the players id because the CM 11 checking and players names (ex the players with name Maicon they use the famous Maicon id)... Don't import leagues, teams, kits etc..Only players (new players who they aren't in FIFA 11 default database)...
7. Save and close...
8. Open the new database with DBM 11...Import the modified with excel txt files:
- Teams txt
- Leagues txt
- Teamplayerlinks txt
- Leagueteamlinks txt
- Formation txt
- Formupdate txt
- Teamkits txt
(don't import players names and players txt..)...
And you will have a FIFA 13 database for FIFA 11...
Then you should import graphics like new kits, new balls with FIFA 13 balls ids (or change the teams-balls with CM 11), boots, logos, minifaces for new players etc...
note: If you have problems with some teams stars you should delete the gks and make new gk manual...
Ex If Galatasaray doesn't have stars, you should delete its gk and create him for the players create menu...Duplicate doesn't work...So you should make new player and copy-paste his settings...
My english are not good..I hope that you understood what i wrote..