Is there a blockchain tool/code that takes two BTC transaction ID's and determines a distance between them.

It's 2017 and Bitcoin Privacy (aka trying to walk around in the public without a sign over you saying how much money you have in your pocket) is still left entirely to the user. I'm trying to explore different methods of adding privacy to bitcoin to protect myself but I have not found a good way to measure how well one method works vs a different method. Something like blockchain.info's taint tool (now hidden on their site) is nice but feels clumsey when trying to determine familiarity between two addresses or transactions.

I clearly know that the two addresses are related but want to determine how trivial/untrivial it is to determine that on the blockchain. After you've washed your coins, what methods do you use to check that it worked sufficiently?