According to my understanding, a Performance Production vehicle can be configured (via options) identical to a Signature Performance vehicle but for the availability of the Tesla red exterior, the white leather interior, Singnature badging, and an earlier delivery date. Interior appearance of both models will be identical I was told by sales people.
The Signature Performance includes the tech package, the upgraded stereo, the shelf, and the twin charger as standard. These items can be added to the Performance Production model. Note that the second charger is only needed if you intend to buy the high power wall connector, which is an option with both models.
Both models include 21 inch wheels/tires as standard, and both may be downgraded to 19 inch wheels/tires (with no credit at the present time).