Rerouting CRM Form Links

We are currently implementing a new CRM and need to figure out how to reroute the form links from our current CRM to the new links in our new CRM.
These links have been shared all over our company and employees social medias for 3+ years and we don't want someone to stumble on the link and be taken to a 404 page.

The current CRM URLs and the new CRM URLs will share the same custom DNS.

Does anyone know how to reroute a URL to a new URL?