Hi there, some smaller updates happened between the 2016 and 2019 in terms of bottom shape and outline, mostly to support the double moves/"pop" needed for the jumping moves, as well as a more compact feeling. I have to admit I don't test the Skates myself (or foil race boards, but everything else we have), but was on the beach while they were tested by Gollito and a few riders/shop riders etc. They were stoked, felt that the shapes were better in every aspect, so good enough for everyone else I guess.
Yes, we usually keep our shapes the same for 2-5 seasons, with graphic updates, in this case they are the same yes.