If all transmission fluid is the same, then they would not have charge different prices and given them different names.
In an auto transmission, there are planetary, sun and ring gears - simply put, there are fluid clutches that hold these gears to give you forward, neutral or reverse... Automatic trans. fluid is used to apply these clutches, when the wrong fluid is used, the clutches will seperate = SEVERE transmission damage.
Please refer to manual, always.... always change your fliter or clean the screen on every transmission fluid change intervals.
AMSOIL universal is OK... Quaker state universal only... these are Type T-IV compatible.
