Delboy

Hi Have trouble with son’s VW Passat 2011 saloon 2 ltr tdi Bluemotions rear o/s abs sensor……Information supplied to supplier Reg & Vin number , received black sensor where as one on vehicle is grey…..is this detrimental to abs operation? (Fitted black one & reader states ‘incorrect signal’ ) Changed wheel hub & magnetic ring🤔 TIA