It looks like the they did lengthen that to a full size mini PCIe slot on the 9020 USFF. I have the 9010 USFF but not the 9020.
View attachment 480750 9010 USFF motherboard.
On the right side you can see the 9010 USFF has the half-mini slot.
So you might need to get a half mini to full size mini PCIe converter. You'll also need to use the AirportBRCM fixup kext and possibly one other that I'm not recalling right now. Those are needed for BT to work. Perhaps
@BillyGoatGruff could give you the details on that.