Deploying communities can be challenging, so much so that we've written a blog post about it.
There are several metadata types associated with communities, including:
Network- The community's settings
CustomSite- The settings for the associated site
SiteDotCom- The binary blob that contains the site content
SiteDotCom metadata type that includes the content, so that's where any community pages you've created will be. It's also why they won't appear as a separate entry in the comparison results table within Gearset, and you'll need to deploy this metadata type to see your page in the target.
However, you can export the pages, so you can treat them as separate entities and reuse them in different communities should you wish to:
If you've exported a page, it will show up in its own row on the comparison results page, with the
Lightning page metadata type.