Which is better- To create a new CDT or update existing one while restructuring the tables?

We have created few UI's and process models of our application. And now, we got to know that we are restructuring our table structure. 

Old tables does not have foreign key relationships. However, in new table structure there is foreign key mapping. What should I do now? Should I update my CDTs or create new ones for new table structure.

If table structure has only field name changes or type changes then it would be easy to update CDT. But now as the new tables has foreign key relationship what should be better to do?

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