Can I use the same poll on more than one page?

Yes. A poll is not tied to the page it appears on. Every poll you create is saved in your poll library, and you can place it on any page or post you like.

To do this, add a Poll block where you want the poll to appear and click Select existing. You will see all the polls in your library. Choose one and it will appear on that page, with all of its existing votes and results.

If you place the same poll on two pages at once, both locations feed the same poll. Votes from either page are added to the same set of results. That is useful if you want one question answered across your site, but it does mean you cannot tell the two pages apart in the stats.