Here are his slashlines as a pitcher and DH.
P: .214/.323/.464/.787 with 3 homers.
DH: .272/.360/.556/.916 with 158 homers
He's actually got very few plate appearances as outside of DHing. Only 65 as a pitcher and about 60 as an OF or PH. He's got 2595 PAs as a DH. The numbers from OF/PH would skew his non-pitching slash up slightly, but not by much. I have no idea how many of the DH numbers are from when he stayed in after being taken out after pitching, but since that rule allowing that has only been around a couple years, it can't be too many.
Suffice to say, there is a huge difference.