How do you differentiate British Europe Units and British Pacific Units? They are all the same British Unit on the map once they are placed no matter which Capitol’s income placed them.
All that matters is where the territory resides on the map as described in the rulebook (Page 35 Europe 1940 2nd Edition)
The Europe economy includes all of the territories controlled by United Kingdom on the Europe map. London is its regional capital. The Pacific economy includes all of the territories controlled by United Kingdom on the Pacific map. Calcutta is its regional capital. There are two exceptions to this regional division. West India, on the Europe map, is part of the Pacific economy, and the North American territories on the Pacific map are part of the Europe economy.