I'm thinking about adding a couple of Ring Stick Up Cam 3rd Gen Battery devices to my current system. I'm seeing two different model numbers come up , sometimes on the same websites with a price difference of only a pound, but with otherwise identical specs. I'm not sure whether one of them is accidentally listing a 2nd gen as a 3rd gen. The two sku numbers are 8SC1S1 and 8SC1S9. Any advice on whether they are actually different cams or which is better to go for?