Remix is like the Next.js Pages Router + a helper similar to Server Actions. It does not support Server Components (what the App Router uses) and they're exploring using RSC in the future. So definitely different.
For example, `getServerSideProps` in Next.js is the same as a `loader` in Remix.
If you're not you stick with pages router and get ready to fork as soon as they drop it. (Just don't ask when that will be https://www.reddit.com/r/reactjs/comments/156m504/comment/jt...)