aftermarket Camshaft position sensor not matching up with OEM? Any one have this issu

Hey guys i recently had to rerplace my Cam pos sensor, i went to local parts store and picked it up after going home and taking out the OEM part i found the aftermarket part was not the same as the oem, i called all parts stores and checked with the local mitsubishi dealer all were not the correct part as the OEM, after some searching i found the sensor in china for far less good for me.. has anyone else experienced this issue