The red and green versions of that Ultimecia Castle exist in both versions of the game, and the scripts to switch to the green version.
I don't know much about VIII scripting, but the difference is in Entity#10 director0, Script#1 Default. The English version has these lines:
PSHN_L 1
PSHN_L 53
REQ 12
I don't have the means to test it, but getting the blood version might be as easy as removing those lines in Deling.