I do believe that it is inspired by the 250D in terms of look and development though.
https://help.cinestillfilm.com/hc/en-us/articles/5077764900877-What-film-is-400D-based-on-
https://help.cinestillfilm.com/hc/en-us/articles/5077950913805-Is-400D-a-new-film-
My understanding was that that was the case for the 800T and 50D film stocks, but not for the 400D.
https://help.cinestillfilm.com/hc/en-us/articles/5077764457485-Is-400D-a-repackaged-motion-picture-stock-without-rem-jet-
Assuming that the information on Gosselin is correct, then it can't be the 500T variant since aurora would be an 800D film. This is what intrigues me most: that it is an explicitly daylight balanced film which I have only seen from cinema film. Cinestill has produced their own custom daylight...
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