The differences of the D750 and D600 is similar to the D600 and D7000 you have. The vertical buttons on the left are in a different order and the top right buttons by the release are slightly different. And the thumb buttons for AF lock and that area. When I had just the D7000 I had the button layout with no problems without even looking. When I added the D600 the 2 bodies are very close in size, etc and I was constantly hitting the wrong buttons - primarily the ISO and zoom in/out to look at an image. When I had only the D600 I had no problem with button layout. I then had the D750 and D600 together and was also hitting the wrong buttons. I reprogrammed the D750 video button to ISO. So only zoom I confused. I then added a D500 (pro DX) which has a totally different button layout. So no confusion without looking. Loved the lit buttons though - when it's dark the buttons light up. But using a D7200 with the D750 now and once again .. if I don't look at the buttons I can get them mixed up. LOL I loved having two FF cameras when I 2nd weddings. one with a 80-200/2.8 the other with a 24-85/2.8-4 lens. perfect combo. But I stopped doing that and couldn't justify having 2 FF .. so I don't know why I added the Pro DX .. but I sold that after a while for luckily more than I bought it for. The D750 is a great camera .. with a couple annoyances. Such as when you hit the ISO button the rear LCD lights up with a menu that you can just simple ignore.