Hi - I've just bought a 2019 Jazz with the shallower boot hollow - it won't fully fit a full-size or space saver spare wheel.
However, other Forum members have said that the space saver spare wheel will only project about 1cm above the boot hollow - I can live with this as I'd prefer to have a spare than the tyre sealant to use in an emergency. However, there is no screw-down point for the spare wheel in the 2019 version - I'm therefore going to snugly fit the wheel in with other soft material and supplement this by attaching it to cargo straps connected to to the 4-anchors in the boot (to ensure the wheel doesn't fly out in an accident).