The car isnt just an RS18B but there are very few updates on it compared to the other cars since the beginning of the season. It's one of the most conservative cars aero-wise. There are tiny tweaks on the BB, FW and small changes to the floor (yellow) in Spain and that's it. (RW, monkey seat and t-wing arent updates) In Baku they extended that vane (red) hanging from the lower sidepod lip - now it is attached to the floor, like on the FI... and that's it regarding visible aero updates. Mclaren, Haas, FI and STR look more agressive and prolific in their aero development, not to mention the big three.
It's 2018 all over again... but i'll withdraw what I said about the RS.18; that car looked like a revolution of the RS.17 compared to this RS.19 because atleast the 2018 internals and the packaging have bee entirely redesigned for aero gains compared to RS.17... while this car retains the same internal and external design and philosophy.