It would depend on whose training methodology you were following. For e.g., we don't use RHR in our (HR) zones, but other may use the Karvonen zones. However, paradoxically, if you use the Karvonen zones, your training HRs go up if your resting HR goes up (e.g., if you're ill), which of course would be the opposite of what you'd want to happen.
If you follow the training methodology of a coach or sports scientist, then you'd need to check how they develop their zones.