Hello I compared them and to me it looks like the signature is real.
I have done this before I posted the picture here, but since I am a member here at this forum, I have read so much about fake autographs and how difficult it is to determine if it is real or fake.
About many Freddy Mercury signatures I thought that they look genuine, but a member of this board told me otherwise. For me it was not possible to spot a fake one from genuine one.
With the Arnold signature I would hope it to be genuine. If it is I can only guess.