100% correct about Sabby being exclusive to Renderosity. Beatrix could be a Sabby model, but not Shona. My big issue with Sabby is that almost all his models look identical, at least to me, especially his collaboration with Seven (SASE). With a few exceptions, they are all about the same age range and basically the same shape and he/she only uses a few different skin resources.
I tried Aliss from SASE and it is closer, but still off. The body shape is close. Click to enlarge.
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I did versions with Lexie and Tenley and both were way off.