I think that good though it is, the Genos was introduced on October 2nd 2017, the Tyros 4 even earlier.
There are always going to be newer styles and voices on newer models.
If you wanted the newer styles that much, the E473 is priced so low as to maybe consider it as a second keyboard to play alongside your existing keyboard?
I have owned the E473.... and sold it on.... It's a decent keyboard, but, in my opinion, not one that I would hanker after for just a couple of styles/voices. It's more of a mini synth / basic keyboard than an arranger keyboard,
Maybe work on adapting an existing style or even construct your own style in Style Creator to achieve the sound you are after, would be your best chance. Hope that helps.