Just to clear things up for people, here is some additional information. I've swapped on and off Base, Performance, and Model S brakes across two Model 3's so I am quite familiar with the setups.
If you are upgrading the Front Only (From Base to Performance) you NEED the Calipers and the Rotors. Everything else is the same. The rotors are 355mm compared to 320mm. Because the Performance rotors are technically a two-piece design, they are actually about 3lbs lighter each. The pistons are the same size, so it is OK to upgrade the front and leave the rear base brakes.
Performance Front Calipers: (1044641-00-D & 1044642-00-D)
Performance Rotors: (1044616-00-D) x2
For the Rear, a cool upgrade no one is talking about is you can use the Performance Rear Rotors with the Base Calipers. It drops about 3lbs per rotor and looks nicer; I am running this setup on my wife's car. Both the Performance and Base Rotors are the same OD (335mm), however the Performance Caliper uses a larger pad. You CANNOT use the Base Rotors with the Performance Calipers.
If you want to retrofit the Rear Performance Brakes you NEED the Calipers, Rotors, and Jumper Harnesses (for the rear EPB).
Performance Rear Calipers: (1044643-00-F & 1044644-00-F)
Performance Rear Rotors: (1044636-00-D) x2
Perf Rear Jumper Harnesses: (1098480-00-D & 1098481-00-D)
The current cost, from Tesla, for all of these parts is $3,540. Considering the cost of most BBK's on the market currently and coming, this is actually quite reasonable (as are pretty much all Tesla parts compared to any other "high-end" manufacturer).