Here is the May 1, 1943 Revised 15 June 1943:
Note the line at the bottom under the MAY 1, 1943 date.
Here is the May (or first) edition:
Note the Revised line is missing.
While it includes the same contracts.. it covers chassis SNs that the first one does not. It appears that the gas tank variant is in the later issue.... and while most of the engine/driveline pages appear the same, when you get into the later cab/body pages there are some differences.
So while its not an earth shattering revelation... its still a limited edition TM... the first TM9-801 was already in the works when this was released.