I think it updates all units, it's the wireless carplay one but of course that feature won't activate on older models ...
Looks like according to versions.ini the files are compatible with the same units:
70.00.367:
[Settings]
CheckCompatibility = 1,"Compat_Section"
Labels = 2,"JCI_SW_VER","DisplayVersion"
[Compat_Section]
Count = 1
1 = CheckLabel,"JCI_SW_VER",1,"[>='MAZ_CMU-140_31.00.000']"
[JCI_SW_VER]
LabelName = "JCI_SW_VER"
LoadLocation = Custom
[DisplayVersion]
LabelName = "DisplayVersion"
LoadLocation = UP
LabelValue = "70.00.367"
74.00.230:
[Settings]
CheckCompatibility = 1,"Compat_Section"
Labels = 2,"JCI_SW_VER","DisplayVersion"
[Compat_Section]
Count = 1
1 = CheckLabel,"JCI_SW_VER",1,"[>='MAZ_CMU-140_31.00.000']"
[JCI_SW_VER]
LabelName = "JCI_SW_VER"
LoadLocation = Custom
[DisplayVersion]
LabelName = "DisplayVersion"
LoadLocation = UP
LabelValue = "74.00.230"
It also looks like folder gnss inside the firmware updates the GPS unit on the vehicle, this is the file included with fixes:
Also looks like some small changes to voice prompts for english/french and possibly other small fixes ...