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If you set them up as separate rooms, you can not group them, and stream different content to them separately, if you choose. And assuming the streaming company allows multiple streams from your Sonos.
If @melvimbe ‘s suggested link isn’t what you’re looking for, we’ll need a better explanation as to what you consider ‘syncing’. If they’re set up as two rooms, they should not be playing the same stream simultaneously, unless you tell them to.