EER. Subtyping character placement differences

I have a simple question regarding the use of a subtype character in an EER model. I gave examples of diagrams below. My question is what is the difference between using a subtype character "U"in a string from parent to subtype or from subtype to parent, for more clarity, see Chart Examples below.

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Source: https://habr.com/ru/post/1628204/


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