It does appear that there is a difference between the Kew image and the Daisy and Button design from the Pott. Gaz. and Nick's sugar.
Like Margaret, I'd thought that common sense was indicating that the proximity of the date of Registration for 71736 to the Pott. Gaz. advert (which matches this sugar), was a strong indication that they were one and the same design - but it seems not.
During the year in question, there were two other Henry Greener Registrations - 81160 on 15th Sept., and 88120 on the 26th Nov. ........... do we know what they looked like?? Am certain I don't presently have pix of either.