I don't actually know the answer to this but would assume that each lens has differing light transmission properties such that differing tints may come through. But, aside from that, wanted to frame challenge this question a bit:
The reason I ask is my auto white balance in wide angle lens seems to be different from auto white balance when I am using a macro lens or is it just the difference in stops o light
Your wide angle lens is pulling information from a very wide scene while your macro lens a very limited scene. Your camera's AutoWB is attempting to find the exact color temperature of the light so as to set the right WB but it is doing that based on the information it sees through the lens.
If you change that scope, why would you think the AutoWB would remain the same? AutoWB can even change with the same lens from shot to shot as the camera decides the WB per shot, not per shooting session, location, or anything more complex.
So, yes, using a different lens may force your camera to interpret the WB differently, thus changing it. So too can using the same lens and shooting different subjects in the same scene.
If AutoWB were any good, we wouldn't need grey cards/color checkers/expo discs/etc. ;-)