When I import a motion into Blender via CC/iC Pipeline and load the motion via Load Motion Sets it causes my character to offset. The Rest Position is fine, but the rig is offset when the motion set is applied.
Character_HIK and Walk_M, have different bind poses. Looks like one is a T-pose and the other is an A-Pose. You can’t swap animations between them without retargeting.
Why they have different bind poses is a puzzle. Is it an old animation file or from an old CC3 character? I think the older CC3 G3 characters were T-posed.
Edit: AccuRig characters can also have non-standard bind poses. It’s generally best to send animations to Blender using the same character, otherwise differences in the bind poses will always cause problems. Unless you’re Rigifying and retargeting, but even then it’s not going to be perfect unless the animations have the same source character as the rig.