Yes... All C1/C2 correction circuits usually work deterministic, from which follows that the result on the same (wrong) C1/C2 information will always be the same.
But these CDs are like already scratched CDs (with many read errors). So there is no buffer for some wrong symbols on a sector anymore. Any new scratch/hair /whatever will cause a real read error with a much higher probability!
So, do you like to buy a new CD that is already scratched?? That is what you have done!
cu, Andre