Assuming two identical pool with identical chemistry and identical weather conditions, both with no combined chlorine, will the chlorine be depleted at the same rate regardless of the chlorine level?

Example:

Pool A =
0.0 CC
6.0 TC
6.0 FC
50 CYA

Pool B =
0.0 CC
20.0 TC
20.0 FC
50 CYA

I will not be able to attend to my pool for several days and am considering shocking while I am away. If my pool normally consumes about 2.0ppm of chlorine per day, should a chlorine level of 20 be reduced to approx 10ppm in 5 days?

As usual, thanks for you help,