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I would tag those Captain Ersatz.
As for the differences. Captain Ersatz is a stand-in character, used when the creator can't use the character he wants to (ex: The cast of Watchmen for the Charlton Comics characters). Expy is when a character is similar, but isn't supposed to stand in directly for another character, or at least doesn't do so intentionally. (Ex. Man-Bat from the Batman comics and The Lizard from Spider-Man). Alternate Company Equivalent is an intentional effort to make the next Captain Whatever. (One of the most prominent example is Captain Marvel to Superman).
My name is Freezer and my anti-drug is porn.
A Captain Ersatz is the original character, but changed just enough to avoid a lawsuit. An Expy is obviously based on that character, but is clearly not intended to be them. The key trait of Alternate Company Equivalent is that the character originated as an effort by another company to fill the same niche. Depending on the level of similarity, it can fall into expy or ersatz territory (the latter if they were being particularly unsubtle), or neither (because the resemblance can be coincidental). CLICK HERE FOR EXPLANATORY EXAMPLE
As for your question, I'd also call them Captain Ersatz, if they really were basically just cut-and-paste of the original characters.
Edited by Synchronicity
Thank you, Synchronicity.
If it was about the actors reprising roles similar to their characters it'd be Casting Gag, but what trope fits this situation:
The 'Verse has been created, and it's similar both to Earth-1 of Arrowverse and Earth-199999 of the Marvel Cinematic Universe with characters that are very similar to these DC Comics/Marvel characters:
However, rather than them being referred to explicitly by name, they're given different superhero names and slightly similar names (although Becky Sharpe, for some reason, is kept as a name), characters who are very similar in abilities and backstory are created and the audience easily recognizes them (but this isn't a Parody of the Marvel Cinematic Universe or DC Extended Universe, instead being its own superhero universe).
Are these a Captain Ersatz, Alternate Company Equivalent or Expy and what's the major difference between all three tropes (especially as Alternate Company Equivalent doesn't seem to have a Laconic page or on the canonical trope differences list).
Edited by Merseyuser1