There’s no difference in file size between the Wurli 140b in Keyscape Lite or the full mothership. They’re exactly the same. Lite just has less keyboards (but the most important ones are included). There’s no 200a in the Lite version, though.
As for Purgatory Creek, I have (and absolutely love) the Kurzweil version, with the 140b at 250MB, half the size of the Kontakt version at almost 0.5GB, while the 200a versions are more or less similarly sized at 250MB, if I’m correct.