What sets the '15RR apart is the DDC suspension (first seen on the HP4), gear shift assist pro (clutches changes up and down the box), rider pro modes so that you can tailor make traction control settings, cruise control and heated grips. Depending on what option boxes have been ticked will dictate what the bike has but you want all of the above even if you don't always need it - I'd also throw in forged HP wheels as a desirable option. None of the above can easily be retro fitted and to be honest I can't imagine there are that many '15 bikes that don't have all of that on.