I have a page layout which is using content type A, A contain a field control, let's say a summary link control in it, so when people edie page layout, they can type in summary link, however someday we decided to switch to use content type B for my page layout, and content type B does not have summary link field control but have some other fields we needed, I can switch content type either from the UI or code, and I tested the page layout , created some testing page, it still working fine, the summary link control still can save the data, even though content type does not have it.
It looks like it still working fine and meeting our requirement, but i wondered if there is any potential issues?