I have a hunch that the plate is different for the twinair or diesel engines.... but may be wrong, and it might be owing to different production dates?
Here are two photos from other posts on this forum about the sump guard (and rust)... they are slightly different shapes – although the difference is subtle:
Towards the front edge, to the right (as seen in these photos) of the centre line there are differently-shaped depressions, to fit around different arrangements of turbo plumbing I think. I can't quite make out, but to may be there is a slight difference around the front, outermost bolt holes of the side plates with a X pressed into them)