There were several hp versions...
for one thing... they actually changed the size of the bore in order to meet the European standard for size / taxes on engine displacement..
Then there was a change in the shape of the piston/precombustion chamber ( which must match )... this added some power... then they changed the number and then the size of the holes in the precombustion chamber...
The changes are listed by engine number... so this can happen during the production year....