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there are a couple of ways I can think of: 1. Use an OR in the metric definition- assuming that the events are exclusive - Mixpanel actually allows for writing JS in the metric conditions. You can get pretty custom here. 2. add one experiment with two different metrics - the statistical significance will not be visible, but you can run the numbers through another calculator (a lot less ideal)

A third could be creating a new metric based on a new event that tracks this specific dual-use conversion for both variations. That way you are containing the experiment-specific changes within a new namespace without introducing unusual data into your standard metric.