Given that most things are competency based. If you are trained well enough in an RA aircraft surely a GA AFR should suffice? Providing you use the same aircraft type in both categories.
For example if you trained CSU in an RA registered sling then used a sling that was identical apart from GA registration for your GA check
As a side note for an AFR to count in RA-Aus, it needs to be conducted in and aircraft below 1,500kg MTOW. Not an issue for RPL holders I realise but for PPL and above you would need to consider this.