Yes they are in the same space. The key difference is in how opinionated each is.

PartyKit is extremely unopinionated. It's essentially lightweight javascript server, that launches fast and autoscales (I don't say this as as a bad thing, it's a useful primitive). Most people seem to run yjs in PartyKit, but you can also run automerge or even Replicache – my company's other project.

Reflect is entirely focused on providing the best possible multiplayer experience. We make a lot of choices up and down the stack to tightly integrate everything so that multiplayer just works and you can focus on building your app.

That's the plan anyway :).