They are one and the same. But in the promotional story materials, Webley and Palmer present themselves as the discoverers and producers of (the fictional) Evelyn and Evelyn. The argument is basically whether or not that plays into icky tropes about disabled people being exploited by able-bodied folks. Defenders are saying "no, that's just what producers do!" and I'm saying, "Hold it right there..." and wanting to point to, I dunno, Motown and J Records and anybody who's ever used the term "Svengali" in this context, really.