We’ve had a period when our 3 year old had the same problem. Even after he would fall asleep and we would turn the light off, he would find himself in the dark and yell for us. I put a night lamp in his room with a 4w LED dimmed at 1% and that solved the problem! The light turns off at sunrise.
No, they are not the same voice, but to the kids doesn’t sound any different. Funny you mentioned, they really should include ST & Sonos integration in the “potty training books”. It worked well for our 3 year old and we are getting ready for another round of “Who wants to do stickers! It’s time for pee pee” reminders every 90 minutes for our 2 year old…