post 101 - the green box is a mains powered load switched on & off by the relay
in the diagram its shown as a pump but in your case it can be the speed control for the spindle motor
post 102
if its the 12V supply shown on this diagram
Attachment 435552
then yes
photos of the boards you are now using in your machine will be useful and the manufactures part numbers
so I can double check what you have now
John