Put the version you sent and the version you got back side by side. The tool tells you whether they match, and then shows the words that moved.
Paste both versions, then press Compare.
Exact match means every character agrees, spaces and punctuation included. Same wording means the text agrees once repeated spaces and capitalization are set aside — usually the answer you want after copying between systems.
Different means the word sequences moved. The marked passage below then shows where.
A changed “30” to “60” is one word in the count and a different agreement in the document. The tool cannot tell you which changes matter, and it does not try to.
For contracts, code, or a manuscript where every edit carries weight, use a proper diff tool that preserves line history. This one is for the ordinary case: did the paragraph I sent come back intact?