When does ColorblindCasting become BlackVikings in period works?

Black Vikings (a racial minority in a historical setting where this would have been unusual)'s description says it is a subtrope of Colorblind Casting (anytime characters are cast without regard to race, ethnicity, or sometimes sex). So I am a little confused as to how to delineate these when it comes to period works. Particularly works like these:

• Hamilton casts (as in, it's in the casting outline to cast any ethnicity except for white) people of color as the Founding Fathers and adjacent characters. However, the characters are still implied to be white, since there are mentions of slavery peppered throughout the work.
• The Personal History of David Copperfield (which I added to the page, but now I'm not sure) casts people of color in an adaptation of a Charles Dickens novel. Characters who are blood relatives don't have matching ethnicities (eg. an Asian dad with a black daughter) and the story is pretty much unchanged.

Are these examples of Black Vikings?

Secondly, is it actually a subtrope, or just a "related/see also" trope? Should these works be listed under both, or just one?

I'm not sure, but Colorblind Casting could lead to Black Vikings if it doesn't justify it (for example a non-Japanese immigrant moved to Japan and managed to become a Samurai somehow), and for the Hamiliton one, this may be a stretch, an POC version of Furry Lens.

Edited by Cutegirl920fire on Aug 9th 2021 at 4:02:20 AM