What I assume is the First Class one (J) has 6 berths not 10, with two appearing to be only single occupancy.
Also, what do the current standard Mk3s have? I thought it was 12 or 13 berths depending on whether it was a SLEP or SLE (but may be wrong)? These are showing as having 10.
They're also diagrammatic only - not giving a scale representation of the design/layout I don't think.
...if you look closely at K, the windows on the berth side in the diagram are still as per the Mk3, but no longer line up (or are the same number as) the berths. So looks like they've not changed the outer template, just the number of berths within the coach diagram.