It's difficult without a mapped ncd tool.

My workaround to compare sets of ncd files is:
1) generate a set of baseline settings for the stock FA (see process below) in one folder
2) modify the FA with the required change e.g. add 5AR, and generate settings in another folder
3) compare the resultant set of ncd files using a tool such as WinMerge and identify which cafd/ecu's require changes
4) open each of the impacted baseline ncd in FDL Editor and Save As .fwl to convert them to human readable text
5) repeat the process for the changed FA ncd
6) compare the fwl folders, again using winmerge, and see what the code settings are

Process to generate ncd based on FA. Assumption is you have a taken a backup of your SVT:
1) In e-sys choose Coding-Verification section
2) Load chosen FA - baseline/modified
3) Browse to your SVT from 'Verification by SVT' section
4) configure a folder for the Trace Directory, tick checkbox for NCD-Trace
5) Click on 'Start Complete Verification'
6) Move the resultant ncd files to a new folder named Stock_FA, or Stock_plus_5AR etc

To compare supplied ncd files e.g. from one car to another, you can modify the process so you just jump in at step 3 of the first instructions