We have a very dynamic site, with a large number of pages.

We use a sitemap index file, that points to several smaller sitemap files.

The question is: Would there be any issue if we include the same URL in multiple sitemap files?

Scenario:

URL1 appears on sitemap1.

2 weeks later, the page at URL1 changes and we'd like to update it on a sitemap.

Would it be acceptable to add URL1 as an entry in sitemap2?  Would there be any issues with the same URL appearing multiple times?

Thanks.