I've been back through those Sowerby Nos. as suggested, but can't see this exact design.............. As we know, Registrations were often for the basic shape only, and didn't show the ornamentation or decoration that ended up being applied, so there's some room for imagination or whatever when it comes to deciding on what the match really is, and it's not often that we have as much of a problem as this.
In the next day or two I'll send Fred some images of what I consider are 'possibles', so see if two minds are better than one. If he thinks that one of these is correct, then I'll do the necessary and post the re-sized and watermarked Kew picture - but at the moment can't guarantee we're going to be successful.