Locked and unlocked Music Room from Double Dealing Character in the trials (left side) and full versions (right side). Versions B were used for the screenshots, due to larger window size.

seen from Türkiye

seen from Australia
seen from China
seen from Netherlands
seen from China
seen from China
seen from United Kingdom
seen from Switzerland

seen from Japan
seen from United States

seen from Malaysia

seen from Malaysia
seen from Slovakia

seen from France

seen from France

seen from Australia

seen from France
seen from Netherlands

seen from France
seen from Türkiye
Locked and unlocked Music Room from Double Dealing Character in the trials (left side) and full versions (right side). Versions B were used for the screenshots, due to larger window size.

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Shinmyoumaru Sukuna's 小槌「お前が大きくなあれ」 Mallet "You Grow Bigger!" survival spellcard from Double Dealing Character. The gifs are from Normal mode.
Raiko Horikawa's 「ブルーレディショー」 "Blue Lady Show" survival spellcard from Double Dealing Character.
The overlaying texture from Mamizou Futatsuiwa's spellcard background has changed in Unfinished Dream of All Living Ghost.
As a comparison, I've used a gif from 100th Black Market. You can see that the texture used to look like some flying birds, but now it's the "censored" effect from Nue's spellcard background.
Spellcard name butterfly background from Double Dealing Character, Impossible Spell Card, Legacy of Lunatic Kingdom and Hidden Star in Four Seasons - 640x480 resolution
Spellcard name butterfly background from Double Dealing Character, Impossible Spell Card, Legacy of Lunatic Kingdom and Hidden Star in Four Seasons - 960x720 resolution
Spellcard name butterfly background from Double Dealing Character, Impossible Spell Card, Legacy of Lunatic Kingdom and Hidden Star in Four Seasons - 1280x960 resolution.
The 1280x960 resolution has a different butterfly background than the other two. This happens in other games as well, but I will showcase them in another post.

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In Perfect Cherry Blossom, all Prismriver Sisters have the same spellcard background and no matter who you fight, the name in the upper left corner will say Sister Prismriver.
In Double Dealing Character, the Tsukumo Sisters have both the same spellcard background, but depending who you fight, the name in the upper left corner changes (Tsukumo Yatsuhashi, Tsukumo Benben or Tsukumo Sisters).
Evolution of Cirno’s spellcard background: Embodiment of Scarlet Devil ⟶ Perfect Cherry Blossom ⟶ Phantasmagoria of Flower View (same in Shoot the Bullet) ⟶ Double Dealing Character (same in Impossible Spell Card) ⟶ 100th Black Market.
The texture has been the same since Phantasmagoria of Flower View, but it seems like different effects have been applied to it in the following games so it appears darker/lighter.
The font used to write the romanization of Wakasagihime’s, Sekibanki’s and Kagerou Imaizumi’s names is different than the one used for the rest of characters in Double Dealing Character. The font used for the Japanese names seems unchanged.