Make sure your source branch of the pull request is selected in SourceTree, then locate the target branch you are merging too in your pull request under Remote,right-click on it and select Diff Against Current. Then you can use an external diff tool, like P4Merge, to compare the files that Bitbucket are reporting as having a conflict.
You could also do a merge from the remote target branch into your local source branch but doing a Pull from the target branch, that will show you the conflicts as well.
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