I'm using the Durst M670 colour enlarger and was just about to try out split grade printing for the first time when I came to realize that the filter settings for Ilford Multigrade (says ilfospeed multigrade?) in the manual dont match those given by the Ilford website. Am I not understanding something? my manual for example gives grade 2 as Y36 M46 where as the Ilford site gives Y52 M20.

Any thoughts?
Thank you