Ruthvens King or Mexican Milk?

I purchased this beautiful snake recently (first two photos). Sold to me as a Ruthvens King Snake. Then I saw this video from Snake Discovery, claiming that this snake (last photo) was a Mexican Milk Snake. They look almost exactly alike to me. My research shows a lot of variability in the appearance of each. Also, Their ranges overlap and I understand that they may hybridize, even in the wild. So, it may be very difficult to know which is which. So what is this snake? Ruthvens King Snake or Mexican Milk Snake? I was hoping to learn more about my new pet. Thank you.