There is a slight difference between the 60 and the 70 grills. If you look at the straight edge that the center strip covers; there is a notch cut out at the bottom. This is too allow the handcrank to pass through. On the 60 the hand crank is a little higher than the 70 and so the notch is a little taller. That is the only difference and they will interchange, however if you put a 70 grill in a 60 and want it to have a hand crank you'll need to cut out that notch a little.

Danny Tabor