So do you think in May 1991 for a car ordered to go straight to AMG they could have spec’d it with some bits with the new logo?
It's possible, its hard to say exactly when these new logo parts became available. Your 91 seems like a mid production car but, the pictures you show seem to show aftermarket AMG parts that look like aftermarket items, specifically the door wood and door sills. 1991 is too early for inclusion of AMG options into the VIN, but it never hurts to decode your VIN to see what data it returns.
You also show original AMG Aero wheels, which to my knowledge, only had the old style AMG logo on them and basically were phased out in the late 80's. I have though, seen a few sets of these with the new logo, come up for sale used. I have not seen these in any AMG wheel catalog FWIW.
It does not make much sense to me to reissue a discontinued wheel with a new logo and especially since they use the larger center cap than the original Aero 1's, thats great since they can use the newer Mercedes caps, but it would be a whole new design, requiring new programming and tooling.
For reference, these particular wheels carry a part number of hwa1244001902. Maybe someone with EPC access could look up that part number and see it its a legit HWA part.
AMG of Japan had some parts that were not available elsewhere and were designed for use in the Japanese market. I could see them retooling for a production run of a discontinued wheel though.