Combining 2 Feedburner feeds into one

Last October I changed my blog from one host to another and in the process changed the url as well from

https://www.kenkaminesky.com/blog/
to
https://blog.kenkaminesky.com/

When I updated the RSS info with feedburner I got a different RSS feed address, and I changed the link on the blog to reflect this. However the old address still redirects the old url to the new one, not sure if that makes any difference or not.

Here is the issue that I can’t figure out. I have a few hundred people who have subscribed to the RSS feed on the old site that are still using the old feed address. While it works (with the redirect), I’d like to combine the 2 different feeds into one for the sake of simplicity and accuracy.

Is there a way to combine the 2 feeds or transfer the old subscribers to the new one?

Thanks!

Ken