Marisa Kirisame's spellcard background is darker in Phantasmagoria of Flower View than in Imperishable Night. In Double Spoiler the hexagons became larger and the pattern doesn't seem to go up as fast as before. The background is brighter than in Phantasmagoria of Flower View.
If you look into the game files, the textures were slightly adjusted in Impossible Spell Card to be brighter than in Fairy Wars. But it's not really noticeable if you put the two in-game backgrounds side by side. There haven't been any other texture changes so far since Impossible Spell Card.
Overall, the general appearance of the spellcard background has remained the same since Double Spoiler (latest game where she appeared is Unfinished Dream of All Living Ghost at the moment of making this post 16-Jun-2023).