I believe the smaller bore had a different compression height.
...The pin is 38mm vs 40mm that is standard, bowl is 52mm wide and 25mm deep.
Compression distance;
12v/24v 5.9L ~ 71mm
24v 6.7L ~ 69mm
12v 6.7L ~ 63mm
I probably wrote it down somewhere where I was sure I'd remember it......