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A few instances I've seen nice features introduced to particular Stack Exchange sites, but then others will be without them. I would've thought it's built upon a similar (if not the same) framework.

Example: The 'sticky' voting panels on SO which (I think!?) are new to a release today or yesterday, but meta doesn't seem to have it?

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The sticky voting panels are currently undergoing A/B testing to see if they're beneficial. If they are, then they'll presumably be rolled out for all users on all sites.

While some sites have community-specific extensions (usually related to how posts are rendered), they generally all do have feature parity. Occasionally Meta (this site) will get new unique features that need to be vetted for bugs/polished, but after that feedback process has taken place they get deployed to the rest of the network.

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