A very particular problem with a CPD

[nadraia]

Hello,
Our french 4x4 must change its plate number while it is parked abroad with a current CPD !

Let me explain :

For a dozen years, our Toyota LC, registered in France where we live, has been based in southern Africa and we find it during our holydays to visit the different surrounding countries. Currently, he is kindly waiting for us in Lusaka in Zambia where we should pick it up next October.
For our Toyota, we have a french CPD that we renew every year and which expires at the end of October 2023.

But in France, we recently moved to another place.The vehicle registration system in the country has changed and now our Toyota has a new Carte grise in France but above all a new French registration number (which I will call RegNew99)! The old registration document and the old number plate (which I will call RegOld11) will soon no longer be valid.

Is it possible to have a new CPD with the new number RegNew99 which would indicate that it is the continuation of the old CPD with the old number RegOld11 for the same vehicle?
Are we not at risk of having customs complaints for not leaving the territory of our vehicle referenced with the old number RegOld11 ?

Has this type of situation ever happened to any of you?

This is a very special case but I would like to have as much feedback as possible before fighting with my Automobile Club.

Thanks in advance
Nadine