Originally Posted by
zacster
That Shimano compatibility chart is pretty complicated, and of course I can't find all the parts that I used for my MTB build on the MTB page. It all seems to work though. With the GRX derailleur and the 105 shifters you would need to check cable pull to know if they would work together. The chart says no, but sometimes things will work. I always thought that Shimano kept everything compatible within the same speed system but I guess I'm wrong.
Yup. 4700 uses 11 speed pull ratios on a 10 speed system and is very incompatible with other 10 speed shifters. Not on the official chart, you can use 4700 shifters with 11 speed derailleurs, and 11 speed shifters with 4700 derailleurs, though they probably have tweaked some of the derailleur dimensions slightly for the different chain widths.