"Tractor supply carries Super S Cotton Pickers Grease (I kid you not), that is equivalent to John Deere Corn Head Grease and is NLGI 00."

For the record, again:

Corn Head Grease is NLGI 0 and Cotton Picker's Grease is NLGI 00
They are not equivalent, but, the difference might not matter?
The spec of original steering gear grease is/was NLGI 00