Can I redirect an old page on my store to a different website?

Yes. In Settings → SEO Settings → Redirects:

1. In Old path, enter the address on your store, for example /blog/my-old-post.
2. In New path, enter the full address of the other website, starting with https.
3. Choose Permanent (301) if the move is for good.
4. Click Add redirect.

New path can be a page on your own store, like /product/new-name, or any full https:// address elsewhere. The redirect then appears under Your redirects, where you can see how often it's used. Redirects are part of the Advanced SEO plugin.