Tomtom XL Euro to Renault Megane Dynamique

I bought an XL Europe satnav about 3 years ago and sold it earlier this year to a friend, we now have the use of a new Renault Megane with a factory fitted satnav to go to France to a meeting next month.

Can I copy the European mapping (specifically France)to an SD card to use in the Meganes Tomtom?

If it is illegal, immoral or unethical please PM me, or otherwise please explain in short easy to understand sentences. I would prefer a seamless changeover, so that as we drive off the ferry, the satnav recognises we are in France and will whisk us off to Marmande without issue :wink:

Many Thanks in Advance