County-class destroyers and nuclear-war redundancy

Were County-class destroyers more redundant and nuclear-blast resistant than contemporary US guided-missile destroyers?

Only in a limited, accidental sense: older British equipment could be less EMP-sensitive and easier to repair, but this was not a major designed advantage.

The County class sometimes retained older systems because the equipment was already available and affordable. Those simpler systems could be less vulnerable to electromagnetic effects and easier to repair, although this was more fortunate economy than a deliberate survivability advantage. The comparison concerns repairability after disruption, not an ability to withstand the blast itself. The Swordfish analogy describes equipment that could return to service with improvised materials and limited support.