Here's my entry
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Not sure if you're aware or not but you're using parts of a design that I made in the past. The middle part is based on my previous work, even though you tweaked it a bit (exact same font / Not all caps / deleted the in between parts / changed the order of the names). In a way you're presenting my past work, as yours (even if you used only parts of it).
Regardless of the fact that both of your entries are invalid (except the Hero version in your 2nd entry, although it needs tweaking in terms of size for both end parts), you shouldn't present someone else's work as yours (be original).
I have a little doubt on that but for proving that he has copied your work you have to provide the proof so that people know and decide that how he have copied your work. As you said he have copied some part of the design you provided so maybe he only copied the idea!
You're right because this is hard to believe situation and you can not accuse someone of using or edit your previous work without a proof cause no one will believe you. Though, you're have been a nice and trustworth person on this forum so far. But you need to convince people watching and the OP that what you said is truth.