The electrical grids in general were fundamentally designed differently from country to country, including the voltage difference. That took into account what

The electrical grids in general were fundamentally designed differently from country to country, including the voltage difference. That took into account what was cost effective from the perspective of large scale deployment, and then individual elements are designed from (and are intertwined with) everything downstream from that. So even if two cities (one US and one UK) were/are nearly identical, the resulting grid is going to end up being laid out very differently.