I am getting up different numbers for boot sizes;
AZE0 (1st gen, post mid cycle refresh): 370L (355L if bose stereo fitted)
ZE1 (2nd gen - current shape): 435L (I assume without the bose fitted)
ZE0 (1st gen prior to mid cycle refresh) will be less than the AZEO due to the charger being located in the boot under that plastic.
The ZE1 appears to loose those plastic moldings's protruding in from the sides of the boot, and it visually appears to have a less sloped rear hatch.