Jetson Nano Module has one listed SKU: 900-13448-0020-000 which I am relatively sure has 16GB emmc.
All well and good, but I am pretty sure that there are at minimum 3, if not more, Jetson Nano Modules.
The original Jetson Nano Dev Kit, SKU 945-13450-0000-000, which I think is the rev A02 board, had a Module with a microSD card slot (part number?).
The updated Jetson Nano Dev Kit, SKU 945-13450-0000-100, which is probably the rev B01 board, which also has a Module with a microSD card slot (part number?), but is compatible with the production Module (presumably 900-13448-0020-000?).
Pretty sure there are also some 2GB variants floating around, but not particularly concerned about those.