XK120 door hinges

Has anyone any thought on why the two door hinges in attached pics has different bolt mounting pattern ie which cars have which
terry

Wide spacing for DHC / FHC so the bolt heads don’t catch the A post, rear of the front wing,t perhaps ?
Edit. The flange on the DHC / FHC is set at a different angle to the roadster hinge of course ,so the wrong thought !
but the clearance issue re the bolt heads/ wing might still apply.
Second edit.
The flange drilling might have been changed to suit the DHC / FHC where there is a clearance issue, and carried over to the roadster hinge to avoid two types of flange.