The old (316) method isn’t compatible with the new (400 and later) method, and unfortunately custom tools from 316 are not directly imported into newer versions.
In the newer version in order to enter a custom tool it is necessary to create a new user library — tools may then be added to that by using the graphical interface.
See:
Note that since the move to curated values in 434, certain entries which were required are now hidden in the data since they are not needed.
For V-angle/feature size see: https://wiki.shapeoko.com/index.php/Endmills#V-bits
Note that the #501 and 502 are intended for PCB engraving — they have a rounded tip which makes them more durable, but not as suited for fine detailing.