If they aren't exactly the same I would imagine they are very close. I can't see Warren having several different dino oils.
Supposedly Mag1 is higher up the food chain than ST Synthetic but I'd also think they are very close to the same.
If I needed to top up my car which had Peak in the crankcase and I had no more Peak available I'd use ST since they have to be very close if not the same,IMO...
Peak, Autozone, Proline, SuperTech, Traveller, etc. Conventional oils are all Warren Distribution private label oils. They are the same oil in a different bottle. There are variations in the private label synthetics though.