The European version thing is a persistent myth, at least regarding the Sansui black dress versions. To my knowledge, every single black panel alternate model had the universally convertible input voltage (100/120/220/240) setup, essentially making them general export versions. Have not seen any that were made as 220 or 240V only (or switchable 220/240 volt) as was required by various EU and UK safety regulatory agencies.
It has been posted here by
@LBPete (I believe) in the past that the black versions were listed in distributor catalogs alongside the silver version, making them available essentially anywhere.
That said, silver was clearly more popular in the US market at the time, and black was probably more popular in some European markets, this is probably what drove the notion that the black versions were for the European market. It also looks like Pioneer may have had their black versions specifically commissioned by a European distributor, furthering the idea that black=European market versions.