I am having two Signature Documents. i want to compare both the documents and i have to return the matching score percentage of how similar two of the signatures.
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Two options for you to try,
1. Use the Apryse WebViewer Component Plug-in. It features document comparison in semantic categories. The score percentage is something you will have to work out depending on outputs I think.
2. Appian RPA has Image Recognition capabilities. Explore and build a bot to do the comparison and return score.
I would suggest to explore Apryse first as that seems more promising to fulfill your usecase and easier to implement too. Hope it helps!