Come on now Dan,
the SD1 styles are easy to find on the Internet and you can always load them into the SD5 memory.
Did you ask yourself why the new Midjay Plus has the new styles (and maybe also the soundset) from the SD5?
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.