The website says that the 162 comes with the R19. I understand that the R20 was only to be packaged with the FOD if that were successfully adopted by the IOC.
Sean O'Brien has written an exellent article on www.CarbonSugar.com
about setting up boards that includes comments on fins. There is also an interview with the shaper from VMG Blades (Chris Ting) on that site that gives good insights into what makes a fast fin. I think there is also an article on Miami windsurfing with Dave Kashy that gives good insights too.
Is the Drake R19 a bad fin? Jesper Vesterstrom did a job on Australian formula sailors over a year ago using the stock Drake fin.