Mastering an SACD is not cheap, and this disk is not going platinum. It is really hard to imagine anyone mastering the same recording twice for different markets. Different versions of cover art, aimed at different markets, is more plausible.
It's just barely possible that Perahia has recorded the Bach concerti twice, and different labels have put out the different versions on SACD. But given the minute demand for SACDs at the moment, I would doubt that's the case here.
It's highly likely that you're looking at two covers and one recording. Buy it and enjoy.