No.
Theoretically, the color associated with a certain ppm color block will develop when the sample or standard is that exact ppm. If the sample is between two ppm color blocks, the color developed by the strip will be between the colors of those two blocks.
The color is not “fixed” for a certain range or for a given step. The color scale is a gradient that is “fixed” along the way at certain points. It is normal to select points that are at least double the previous ppm value. This allows for variation in paper, reagents, process, etc.
Keep in mind that variation in label print runs, test strips, test methods, etc. can contribute to the colors not being an exact match. We do our best to minimize this but some variation is inevitable.