They are part of the same tale that is arc4, which is interwoven from a meta perspective as well.
I don’t have any particular reason that stands out to think these scenes alone are unique and different, and neither do you really from what I see.
From my understanding these are all memories of Meta-Ange who is a piece.
Ultimately tho it is what it is, there’s clear references in arc4 that Ange’s future is but one possibility, and it’s presented in the same way as Lion’s world, just with a comparatively higher amount of probabilities.
There’s very little we can know for certain, it just sorta feels like Ange’s future is something fans wanted so much to be “the truth” (even tho there is a large amount of flaws of information in it) that Ryuukishi ended up sorta rolling with it, as in answering that particular “kakera”, but at the same time arc7 kinda does suggest that it’s very doubtful wether or not this is a real reality. By making the connection between Ange and Lion in the arc7 TP, I think it was trying to be put them as equivalent.
However you could say that it ends up being me who is pretty biased toward the “Ange becomes a writer ending”, as it makes some form of thematic sense. At the very least I openly admit that this is the case. If I truly do follow the hints scattered around the story, well, I can’t really be certain that there is a prime (remember that in arc8 Battler claims the catbox is empty).
Out of the three scenes I mentioned, it’s clearly the weirder one.