If you had a backup of your 910, you can move several things, like the contacts folder (names, phone numbers), and mapsettings.cfg file in your N American map folder, etc.
If you copied to computer any voices, oiis. etc - it is very easy to load them back on your new device through home.
Also, if you had updated your European map through Home in the last 12 months, that map would still be availalbe to download through the account you used to initially do so.
If not - it is gone.