How to display and Handle two different forms with overlapping element?

I have two forms of which some elements overlap.

I was wondering how should I approach the situation, there is a possibility to use tabs, one for the common fields and other two for the corresponding form elements for different categories. Other option is I can save the common elements in a temporary database on 'Next' button click then present the relevant form based on the selection of the category in the previous page. What else can I do ?