Yes of course that is obvious without being rude. My line of thinking is how will clamping force be the same with a billet cap and a std cap. How would you determine what the settings should be as they cant be the same due to material. Any I have seen on various engines have them all billet. Do you know why this was done? I can only guess it was due to a failure of a bearing or crank damaging the journal and possibly the crank. Or as silly as someone lost the other caps.

Again I presume that it was line bored after the caps fitted?

If the other caps can be made by the fabricators I would be interested in the package. I am trying to get a better understanding in what would need to be done.