Beta reactjs 404 & 500 Custom Error pages similarities

Both of error pages under beta/src/pages/{404,500}.js has the same component name and the module is exported.

404.js

export default function NotFound() {
  return (
    <Page toc={[]}>
      <MarkdownPage meta={{title: 'Not Found'}}>
      ....
      </MarkdownPage>
    </Page>
  );
}

500.js

export default function NotFound() {
  return (
    <Page toc={[]}>
      <MarkdownPage meta={{title: 'Something Went Wrong'}}>
      ....
      </MarkdownPage>
    </Page>
  );
}

Open beta/src/pages/404.js and beta/src/pages/500.js and compare their exported component declarations. Rename or otherwise distinguish the duplicated component names while preserving each page's existing behavior, then verify both custom error pages still render correctly.