Normally I would do something like that if I were doing a full merge of all the code.
I have made numerous changes to hundreds of the Stock DS files. As a result, perfomrmng a full merge is time consuming and always adds an element of instability. Right now, my current version merged with 3.0 is quite stable and I don't want to ruin that.
Checking for differences might tell me what's changed but it takes a little more time to see what is directly related to this particular situation. Hence, the reason I asked. It's just faster and easier.

If Crat can't tell me for one reason or another then, yeah, I guess that's exactly what I'll do.