I'm sure they're the same plant. Newbiscus appears to be a trade series, so Mauvelous is the trade name. I corrected the entry, but I don't know the actual cultivar name, so I left that as Mauvelous also for now. The actual cultivar name will turn up someday, possibly on a list of new patents.
Hybrid Hardy Hibiscus (Hibiscus Newbiscus™ Mauvelous)
