It's just caffeine, whether you take it in RB, PP or coffE.
Except when it's delivered as Café Bombón.
I got banned from drinking them when we were cycling in Alicante.
That sounds very similar to the coffee they serve in Kopitiams in Singapore and Malaysia. They even serve the tea with sweetened condensed milk. We took to drinking black tea and coffee as the white coffee was just too sweet for our tastes. The ladies serving always gave us a funny look when we asked for "coffee, no milk, no sugar".