Thankyou very much, obviously seeing them side on everyone can tell as Luther is silver tabby and Zeus silver spotted bsh, so that's easy to see. But when they are on their backs showing their spotted tummies we have to sometimes do a double take-as very often we can't tell until we go right up to them to see their faces lol Luther is big bigger but very little difference in their weight, only 13 days between them. Zeus is the oldest. XRoyalty, I had to look at the two photos many times backwards and forward to see the difference. Beautiful both of them.