What is the difference between DNxHD 60 and DNxHD 90??

Is there a master list of all the DNxHD resolutions somewhere that show the differences between each?

Look Here.

ignition:

Is there a master list of all the DNxHD resolutions somewhere that show the differences between each?

 

Maybe the info at page 754 in the advanced guide is what you are looking for

The number is the bitrate. If it has an X (DNxHD 185X for example) it is 10-bit.

They are all the same raster size (full resolution depending on the mode). All are intra-frame compression.

Basically a lower bitrate codec will tend to show compression most in 'high frequency' detail first (think of trees at a distance, or the rough pattern on bricks). To the naked eye it's very hard, in my experience, to see any difference between uncompressed video and DNxHD.