artard4321
[12] Conqueror
“SOULCALIBUR is well known in the fighting games genre for including iconic guest characters. When we were approached with the idea of doing a crossover, we thought our community would really enjoy playing as the witcher,” said Marcin Momot, Community Lead at CD PROJEKT RED. “We’ve collaborated with BANDAI NAMCO artists to faithfully recreate Geralt, and shared original Witcher 3 assets like Geralt’s model, animations, and weapons. I think BANDAI NAMCO did an outstanding job of capturing all the details and introducing The Witcher to SOULCALIBUR in a way fans of both series will enjoy.” (source)Yes, I recall watching the same interview with the CD Projekt Red personell (it was in one of those Namco publisher diaries in the months immediately before SCVI was released), and as I recall there was no exact mention of sharing assets (which, given the different engines and animation software suites involved, wouldn't necessarily be a super practical approach). Rather, as I recall, they mentioned that Project Soul 'consulted' with them extensively about how to render Geralt and his quality of movement. I'm sure this is probably their established methodology for guests characters at this point.
Though I'm not a 3D artist, I have worked with game engines before and to my knowledge, assets can be imported and configured to work on different game engines especially when provided the original source files. I have literally exported models from World of Warcraft for personal use when playing around with shader code on Unity. Even Square Enix and Capcom were known to have shared assets for the collaboration between Final Fantasy XIV (Luminous Engine branch) and Monster Hunter: World (MT Framework) and edited those assets as they see fit to make it work with the art style and engine of their respective games. Sharing assets isn't unpractical at all especially if you have the original source file...
However, I'm not 100% sure exactly what Project Soul did with the assets given to them. I'm more convinced that they used those assets as a point of reference when creating Geralt from scratch but it's also possible that they modified existing assets to fit SOULCALIBUR VI. But either or, it would be pretty disrespectful to recycle these moves even if Geralt was built from scratch due to the assistance of CD Projekt Red to make Geralt as authentic as possible.