There can be no difference in paint quality of XLi, GLi and Altis the painting mechanism is set at a standard and it's not like they change it for every car going into the process. As per order list of colors only first only the naked body of the car is painted. Then the remaining parts go on the cars.
If they have to paint 10 Silver GLi and 10 silver Altis, they will paint 20 silver cars in a row and those 20 cars are not tagged as which chassis are GLi and which are Altis. That is done later.
Anyways why is this becoming a Toyota VS Honda thread?