Steve, that turret is the modified original pattern. Previously considered by some as the second pattern, the original type having a bevel in the top right hand corner (as you look at the front). The last pattern having a bevel in the bottom right hand corner and usually seen on 75mm armed tanks.
My observations of turrets showed the second type merely to be the first with the bevel cut out, some neater than others! This was to allow for the later mantlet which had two telescope positions, though only the upper one seems to ever be used.
The 95mm turret has a different front plate and mantlet, the hole in the front being wider to suit. The 95mm tube is larger in diameter at that point than the 6 pr/75mm. The BESA in all Cromwells is fixed in line with the main gun and elevates with it but the 95mm installation has it a little further away from the main gun than the 6pr/75mm.