Axle to crown on a Float 36 160 26" is 17.4mm less than A-C on the standard Float 34 150 650b. 650b wheel is 12.5mm larger radius. So your front end will be 5mm higher than stock. Your back end will be 12.5mm lower than stock. That means your BB height will be about 7mm lower than stock.
Suspension set-up, tyre profile and tyre pressure variations are enough to make that lower BB height almost irrelevant. Big tyres and a little less sag than normal and you're back at the stock BB height.