I am using the word YES as a marker and a release with my new puppy. I have other dogs and I used OK as a release command. Do you think I am going to confuse my dogs by using different words?

From Jackie in California: I've been watching the free Michael Ellis videos on your website and I'm now in the process of watching The Power of Training Dogs with Food video on your Video on Demand. I have a 12 week old puppy and I'm starting engagement training by using YES as the marker and it's going very nicely. My questions is that when I trained my other dogs in the past, I used OK as the release word when releasing them. For example from a sit to eat their food, when they had to wait to go outdoors, or at the start line in agility. If I continue to use OK as a release in these different situations, will it confuse my puppy when I'm using YES in engagement and in interaction exercises with me? What would be the best way to handle this?