Compatibility for USD asset in Substance 3D Painter is not a simple yes-or-no result. For feature support, list which features survive unchanged, which are translated, and which need a fallback.
For USD asset in Substance 3D Painter, classify each important feature as preserved, translated, approximated, or dropped. Test the same file in both directions so a successful open does not hide data loss.
Build a compact matrix showing what imports natively, what is translated, what needs setup, and what is unsupported. Apply this feature support guidance to the actual USD asset in Substance 3D Painter delivery path.