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When upgrading from NAV 2013 to 2013 R2 is it now possible to do a technical upgrade. This process is different from the Classic process technical upgrade. When the initial upgrade finish of the database must the objects be compiled (this can be problematic with automation and ISV solutions).
The code upgraded also compare very well and even allow merge of report changes to the RDLC. It is very important to compile the objects because the export. Un-compiled and compiled objects are slightly different in the text format. This start 17:15 into the video. The compare of code is done with the NAV 2013 R2 version of the Mergetool.
Getting a service tier to run on a converted database can also cause a few problems. This video show how that is done. This start at 8:30 into the video.