Hi. The Electrek article
here says the large pack has 4,416 cells and the small one has 2,976 cells. Therefore the answer is no, the small back is not a software limited version of the large pack. Also, the small pack is 55 kWh, not 50 and the large pack is 80 kWh, not 75.
Model 3 80
Actual capacity: 80.5 kWh (350V*230Ah= 80,500 Wh. Source for 350V and 230 Ah, see page 3
here)
Usable capacity: 78.27 kWh (Source: see page 6 footer
here)
Cell count: 4,416 (
source)
Model 3 55
Actual capacity: 54.25 kWh (This is an estimate calculated from cell counts: 80,500/4416*2976= 54,250 Wh)
Usable capacity: 52.75 kWh (This is an estimate calculated from cell counts: 78,270/4416*2976= 52,747 Wh)
Cell count: 2,976 (
source)