I’ll take a stab – albeit, just an educated guess since I’ve never had this scenario before.

Hreflang should be used here, but it also makes it difficult to understand whether or not its worth using given that the content doesn’t change. If the blog page consists of information relevant to each location, such as contact numbers, business address’, email addresses using the corresponding ccTLD or currency conversion then you should absolutely use hreflang.

Without actually knowing how much of the content changes (if you say none of it is different whatsoever) makes it harder to understand.

Just a guess, I’d love to be proven wrong so I can also learn something new.