Within both IK Rig Assets, you must define the root for each character, which is typically the pelvis or hip Bone. Therefore, you should ensure you have created an IK Rig for each of your characters. Retargeting with IK Rig is achieved by specifying a source and target Skeletal Mesh, which are defined by an IK Rig Asset for each of those meshes. Your project has two different Skeletal Meshes to evaluate the retargeting process. Refer to the IK Rig Editor page for how to do this. You are familiar with creating and using IK Rig Assets. This page provides an overview of the IK Rig retargeting process using IK Rigs and the IK Retargeter. Retargeting animations provides a way to share animation data between multiple different skeletons, without needing to create and manage new animations outside of Unreal Engine. This differs from Unreal Engine's traditional Animation Retargeting feature in that you can transfer animation accurately between skeletons that may or may not match, while providing a simplified workflow. IK Rigs can be used to create animation retargeting between different Skeletal Meshes.

Animation dialog box launcher