Thanks for the reply, Elena.
It appears that the expected behavior is not observed. When I create an element with the same find logic, a new element is created with a numeral appended. For example, if I have an element named "PriceTextbox" with find expression = "XamlTag=Textbox,Name=Price" and then use the Edit Element dialog to set another element, which started with a different (and undesirable) find expression to the same expression as "PriceTextbox", when I save the changes, a new element with the name "PriceTextbox0" is created with the same find expression as "PriceTextbox". The desired, unobserved behavior is that the edited element is merged with "PriceTextbox".
I will send an example project with the resulting duplicated element.