Hey BMWDavid, you’re right, that statement is not exactly correct. GN is the mother brand and the product lines are not exact. Feature sets can be different between similar appearing rebranded products in the GN family. I know of no other S90 rebrands out there. The eBay used market would be the most effective. When moving from an analog super power aid like an S90 to a digital aid it can be very challenging because of how the brain has adapted to the style of amplification commonly associated with a linear fitting.
Your other option would be a digital hearing aid set with a linear algorithm which many brands offer, or finding another analog, linear, super power aid currently sold. Those are like hens teeth these days though.