can we notice a colour difference between some glass-panels 8 mm thick and a some others 10 mm thick situated in a facade 10 m high in a building 80 meters long?
I think 100% people can notice! but it also depends on glass configurations. This effect somtimes can't be observed from just supplier sample300x300mm.
The glass thickness normally can't be varied within the same surface because of visual distinction issue which is different from Mullions and Transoms that you can reinforce only at the corner.
The another solution is to use HS at typical zone and FT at the corner with the same thickness. but FT nornally reveals its unsmooth surface especially against sunlight.