64-66 cuda fold down seat into 63-66 dart

If you have time, please do. I have read that they are slightly different, but I can’t imagine why … but if they are, I can’t image by much. I am guessing the Barracuda seat bottom might be lower (shorter springs or reduced padding) so the seat back could fold down into less space to make the rear floor flat, but I am thinking the width is probably the same? Totally guessing but it would be great if they were interchangeable!