Picking a Munsell color for the fabric and surfaces of one's sherds is a staple of ceramic studies. Here's a quick comparison shot of a 1954 edition, at left and courtesy of one of my colleagues here at Troy, next to a 2000 edition. It's of the 5YR page. The top row (hue 8/) has shifted, but many chips on the older edition have held their color well. Note also the layout changes, e.g. 5YR 4/8 is missing at the right. That's the major concern between editions: they are different in the details and that can influence perception. But if the goal is to communicate the general appearance of a sherd, either one would do just fine.