Arrgh! It turns out that the demonstrator I thought was a HS was in fact a petrol ZS. So I must have suffered from confirmation bias when I decided that the spare tyre from that "HS" would fit a ZS EV. In my weak defence, holding the spare next to the wheel of a vehicle, it's hard to judge whether they line up, because one has a tyre under load, and the other has 420 kPa in it (hard as a rock).
Worse, the salesperson tells me that there are 8 (eight) versions of the HS! Some have 18" wheels, others 17" wheels. The different sized wheels have the same pattern of alloy wheels, and 18:17 is only 1.059:1. So I have no idea which if any versions of the HS are compatible with the ZS EV.
The HS PHEV have no spare tyre, and come with the same 8 A EVSE (in Australia) that we get in the ZS EV.
Fortunately, the Chinese are known for their meticulous documentation of their various products, so I'll have no trouble sorting this out. Oh, wait, the other thing...
The spares I saw in HS models were T125/80 R17 99M. The ones with 17" wheels had 215/
60 R17 tyres, which are a little taller than the 215/
50 R17 tyres found on Australian ZS EVs. So that indicates to me that even the spares for the 17" HS would be too big. We could possibly get a space saver with a lower profile, to better match our tyre diameters. And my ZE EV tells me that the spare tyre size "if required" is T125/90 R16.
Wheels!