The bigger line isn’t really because you changed the cartridge, it happens every time the part stays out of the resin for a while. If you are there when there is a need to change the cartridge and do it immediately, there will be no big line at that stage.
Similarly, when the cartridge is almost empty you can see that the printer is doing resin level sensing loops and refill operations much much more often. This leads to the part staying out of the resin for a longer time than usual at regular intervals and this shows in the layer lines.
If surface quality is critical for a part, I would advise to use a full cartridge or at least one for which the printer hasn’t been displaying the “low resin” warning for too long.
All of this is of course a workaround, Formlabs should solve this inconsistency issue on their side but that’s gonna be difficult with their resin dispensing mechanism, cartridge and sensors as they are on the printer.