The Old Trafford meeting will decide the final make-up of League Two next season and is a close game to call with the two sides ending the season just one point apart.
Stevenage, who defeated Accrington to make the final, lost 2-0 at Sixfields in the Cobblers final home game of the season and were also beaten by Northampton on their own ground in mid-December.
Torquay, victorious against Shrewsbury to keep themselves in the hunt for League One football next year, eased past the Cobblers on the opening day of the season at Plainmoor but were denied a double by a 96th minute goal at Sixfields in March.