Maybe it is another version of codec with one common name ALC1220...
upd. I remember two codecs with one device-id and different names. ALC885 and ALC889a. ALC889a have device-id 0x10ec0885.
Asus has a "custom" version of the ALC1220 called S1220 with device_id: 0x1220 (IOReg shows 0x1168) . All other manufacturers install the Realtek ALC1220 with device_id: 0x1168.
dgsga/1220 is using toleda files. Upon completion of testing,1220 files for both device_ids and supported layout-ids will be submitted.
The ALC889a was a "custom" Gigabyte version of the ALC885 (same device_id), marketed as "newer and better"