Model 3 jack points compared to Model S/X jack points
The Model S and Model X jack points are discrete injection molded parts which are attached to the chassis with two M8x1.25 bolts in the outer holes of the jack points. The most notable difference between the Model S and Model X jack points is that the overall height of the Model X jack point is about 5mm more than the Model S jack point. A less obvious difference is that the three holes in the Model X jack point are slightly larger than the holes in the Model S jack point. Pictures of the jack points are attached for reference.
Although the Model 3 jack points appear to be an integral part of the chassis, they are in fact part of the battery pack assembly. They can be used as lift points for an uninstalled battery. But, once the battery is installed in the chassis, these lift points become the jack points for the entire car. The link below includes a photo of the battery pack that clearly shows four of the Model 3 jack points at the corners of the battery pack.
Link to be added here.
The close up photo shows the Model 3 jack point with the battery pack installed in the car.
The nominal diameter of the locating hole in the Model 3, Model S, and Model X jack points is about 25mm. The hole in the Model 3 jack point is slightly smaller than the Model S locating hole, and the center hole in the Model S jack point is slightly smaller than the center hole in the Model X jack point.
The slight difference in the diameter and depth of the jack point locating holes is the reason that manufacturers of jack pad adapters for Tesla vehicles offer separate tools for each of the three chassis.