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If you run into an issue where two files aren't agreeing with each other, WinMerge is very good at solving this. My own issue is something that seems to keep coming up in a disagreement between SimpleNote on one device and AlephNote on another.

(Note that later versions of Alephnote included a comparison tool for this issue, but I had to come up with something beforehand and in some ways I prefer it.)
You can quickly resolve this by just grabbing both files and pasting into WinMerge and selecting F5 to refresh. The differences will be highlighted in yellow (as below):

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If the files are always in the same directory:
One way to speed this up is to create a text file in that folder with the text below
"F:\PortableApps\WinMergePortable\WinMergePortable.exe" . .
.. save as .bat and launch, letting you quickly select both files and compare in the UI.

If the files are in different parts of your computer
Replace both dots from the above example with full path names in quotes, as below:
"F:\PortableApps\WinMergePortable\WinMergePortable.exe" "c:\temp\logs\log1.txt" "c:\Program Data\logfiles\log1.txt"