Almost, in the WKM it's controlled by a baro with input from the GPS, otherwise you would not have any altitude hold unless you had satellite acquisition by the GPS. A/H works just fine on the WKM without GPS lock but once it does have a lock it uses that information for a higher degree of precision.
The Naza is just a baro, but one of the most accurate I've ever seen on an F/C in that price range.