Quite correct. The later stuff uses the 10mm boilts, verses the 8mm early stuff. They also used a different castor rod too.
When swapping the later LCA (with longer ball joint) either the 1200 ute, (or possibly early b310?) steering arms need to be used too. (The longer B310 ball joint uses a larger taper than the early stuff)
I wonder if the SWB and LWB utes use the same steering arm? (In theory they wouldn't, if they were to maintain optimum ackerman angles)