If your question refers to a basic law, then the order of the reaction will stay consistent regardless of what concentration values you may plug in. Concentration is almost never constant in actuality. Remember that based on which graph forms a linear relationship, the order can be determined (it will not change). for example, [Cl] vs time forming a straight line on a graph is zero order, ln[Cl] would correspond to first order, and 1/[Cl] would demonstrate 2nd order. Hopefully this helps answer your question ;)
