But I've never seen portable kubernetes configs (except for vendor software that probably wouldn't be needed outside of kubernetes).

If you just tell kubectl to dump your pod configs, then load them on some other cluster, that definitely won't work.

If you use the management software that generated the pod setup somewhere else, that probably won't work either because the somewhere else is going to be missing the CSI and CNI you targeted. Even if those match, it'll be missing the CRDs. God help you if you want to run two programs on one Kubernetes, and there's a CRD versioning conflict in their two dependency sets.