I am trying once again to copy Keith's "pasta" shot. It is simple but it caught my eye and I felt like trying to duplicate the tone and contrast he captured.

I set my lights and RB67 and pulled out my meter. The difference between the rel=reflective and incident is about 1-1/3 stops...Is it normal for the two types of reading to be different?
Which will or should be more accurate?
Or maybe the question should be when there is a discrepancy which would you choose?