Replacing a Melnor 4-zone with Rachio 3?

I have an existing Melnor 4-zone timer that I’d like to peplace with a Rachio 3. The timer controller is plugged directly into the valves with a circular connector - nothing like the 16+ wire connectors inside the Rachio 3.

Is there anything I can do to make everything work together, or do I need to get a whole new set of valves as well as the controller?

@deathspiral - can you post of picture of your Melnor to confirm.

Are you talking about a Melnor hose timer such as the following?

Yes, a picture would help with the timer and the “circular conntector”.