DocType naming conflict

I have been working on upgrading our ERPNext from v12 to v13

I’ve now got that working on a dev machine. However, it turns out that a DocType we created using Customizations named Donation is the same as a new table introduced in the Non-Profit module of ERPNext version 13.

Therefore there is a conflict. In the ERPNext UI I see the definition for the new Donation DocType although in the database I can see that it has added columns to the tabDonation table. Our data is still in there.

Can anyone suggest any advice to overcome this problem? How can I configure our system to see our Donation type?

(Apologies for another post from me!)