Mix n match interior

Hi I have the opportunity to get some 69 buckets with head rests for my 67 Barracuda. My question is can I use 1969 seat backs with head rest on the 67 seat base? The 69 backs have a latch and the 67's do not. I was also thinking of using dark green covers front and back and dark green door cards with the rest of the interior black. I think the difference in color on black would look good. Thoughts?