Not exactly. Comas just indicate prolonged unconsciousness and inability to react (in terms of body movement) to stimuli, not minimal brain activity.

https://www.brain-injury-law-center.com/blog/brain-activity-...

A complete lack of brain activity is brain death. Brain activity is often slowed in comatose patients, but that varies from patient to patient.

https://www.mayoclinic.org/diseases-conditions/traumatic-bra...