To compare 2 lists of suttas, use DiffChecker. Click on the 1st link above and select the entire file and Copy, go to DiffChecker and Paste into the "Original text" box. Then return to this page and click on the 2nd link above and again select the entire file and Copy. Return to DiffChecker and Paste into the "Changed text" box. Click the green "Find difference" button. To see a sample of what the output looks, like you can click here to see the output from using the two Emptiness indexes above.
Comprehensive Index of Pāli Suttas -
An index of topics, words, people, similes, and titles found in the Pāli canon of the Theravada Buddhist tradition. This is a similar work to the above, but built by hand by Ven. Khemaratana as opposed to the above mostly automated process.