Same tech pack. Same colour name. The fabric feels thinner, the colour sits wrong, the waistband gives up sooner. The factory says it is within tolerance. Your customers do not read tolerances. They read the garment.
To switch clothing manufacturers without losing a season, find out why the reorder changed before you move anything. Keep the approved sample and a failed unit, get a lab to read the difference, then sample on the new floor against the approved piece while the old supplier still runs. Ohzehn Textiles will read the failed garment in our lab and tell you why, free, before you owe us anything.