I love having multiples but in different colors. I honestly think they are too similar. With that being said, I think you should get it since you are in love with it -- and think about selling/gifting the plain chalk one. Good job on returning the periwinkle Dakotah (which I seemed to recall that you don't love) and another bag. Good luck with your decision.
I am so glad that you love your Dakotahs. You are so lucky to have bought a teal Dakotah. I saw the one that was just on eBay but was trying to be good. I would love to have a light blue one, someday after I get off ban island.