I asked this question of Delkevic some time ago, this was their response.
The Delkevic exhaust for the 2004 – 2011 DL650 and the 2012 – 2016 share the same collector assembly, the only difference is the link pipe to the silencer which have different 02 sensor boss size, depending on the year. In essence they will both interchange, although the 02/lambda sensor may pose an issue.