Editing and then changing a Page Type

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I have a technical query concerning the changing of a Page Type. Lets say I have defined two PageTypes which each point to unique .PHP themed pages. They both have editable C5 areas defined but with no overlap on names.

I build my page based on the first PageType, I add lots of blocks, stacks, content, html areas etc - I then save the page.

Now, I choose to change the PageType used by this page to my secondary PageType, to keep the database clean/optimised, is there any cleanup of the now orphaned content that belonged to my previous page? Orphaned because my secondary PageType doesn't use the same names for editable areas?

My thinking is that if not, all content areas should be deleted on the page BEFORE changing it's PageType to avoid filling the DB with orphaned data.

Appreciate your help in advance!