The same colorimeter will produce different results when measuring the same place. The normal error of a colorimeter is generally plus or minus 0.5. The standard plates of different colorimeters will be different, so the error will be a bit large. Of course, if the parameter settings of the two colorimeter are different, the error will be so large that it will not be the same color, such as the light source and angle. Under normal circumstances, the light source and angle of the two colorimeter are the same. There will be an error but it will not be too big. Big, yours is probably the light source used by two colorimeter, the angles are different