No, it relies on the issue number (the summary is not unique, so you can't really use it as a simple match)
You'll need your own mail handler to do that (one that can cope with non-unique strings, and encapsulates your logic on matching - e.g. if the email has a valid issue id, and a valid summary that matches a different issue)
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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