I have both the Apple Leather Case and Magpul Field case for my iPhone 6. When I get the new iPhone 6s, will my cases fit on the new phone? Apple's site says the 6s is 7.1mm thick compared to the 6.9mm 6. They're selling new leather cases (in the new colors) that are stated to fit the 6s and the 6. Will the OLD leather cases also fit both? I can't find the old case model number on the Apple site anymore to check.