Replacing kitchen range with cooktop and wall oven. Wiring help

40 amp breaker. I’m installing a wall oven below a cooktop.

Is there a device or smart junction box that will allow me to wire them together and not have to add a breaker and a new wire? Safely and correctly? I don’t want to burn anything down.

This is in a remote cabin far away from civilization on a large solar system. There are no local electrical via a or I would hire one.