Someone else maybe able to pick them better than me, however they are what were factory fitted to the Cooper and Cooper S models, as far as I know, they were the same, except those fitted to the 1275 S, these were about 3/8" taller.
Difficult to see the first manifold but the second is definitely the standard Cooper/S item.
As the previous post stated....1275 is 3/8 longer....than the 970 and 1071.
Difference in length is the result in the heigth difference in the 1275 block (to accommodate the longer stroke).