Yes! Monitoring both sides of an A/B test in both RUM and Synthetic is important.
You can measure the results of an A/B test via synthetics a few different ways by forcing the experience to occur. Some of these ways include:
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Query String Parameter (easiest)
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Custom Header
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Custom Cookie
Once you set up a monitor to run against the A vs B, you can view the results of each in the Blue Triangle Portal.