You can collapse the diff down to nothing by applying it to the original table. More usefully, you can edit the diff first before applying it. Erasing cells like “+++” or “---” means those changes won't get applied.
For more options and languages, see github repository.
Using with git
Do you have a git repository with .csv files in it? You can make git diffs and merges table-aware using daff. To set this up, run:
Your CSV diffs and merges will get smarter, since git will suddenly understand about rows and columns, not just lines: