Changing URL in existing PBN post

I just want to get sure.

If I have a existing post with one of the URL's of my websites (which is not relevant anymore) - can I just change the URL to give the link juice to my another website (same niche as the previous one)?
Or do I have to make a new blog post?

You can change the link, when google bot crawls the page again it will notice the change.
 
Remove the old link, wait a couple weeks or so, then place a new link on a different anchor.
 
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