How to replace sitemap.xml

Hi All,

Client has provided two .xml files namely a_20221229.xml and b_20221229.xml for two sites i.e, site a and site b. And they wanted to replace content of urls https://a.local:9002/sitemap.xml with a_20221229.xml and https://b.local:9002/sitemap.xml with b_20221229.xml.

I have created CatalogUnawareMedia for a_20221229.xml and associated it with site map for the given site shown below.

Can anyone please confirm, is it correct way of doing or have to do some other way?