Could Nelson fire Lion-class 16-inch shells?

Could the Nelson class use the newer Lion-class 16-inch shells?

Not without modification; Britain declined while stocks sufficed, though Lion service might have driven later ammunition commonality.

Nelson could not simply load the newer Lion-class 16-inch shell without modification. British studies did not justify the change while existing Nelson ammunition remained plentiful. Had Lion entered service, a shared shell could have simplified Pacific supply and encouraged conversion. The answer presents ammunition commonality as a logistical incentive that becomes stronger only when both classes are active.