Running a test, I'm getting this error with Google Analytics:
To check and display pages in Google Analytics Experiments, we add the URL parameter utm_expid to original and variation pages. It seems that your web server won't accept this URL parameter. Change your server to accept parameters
Since Marketo A/B test has the same URL for both the versions, I do not think this would work. Subscribing to this thread to see if anyone has a better approach to do this.