I think it's real.
I do not have specific knowledge of these signatures so cannot offer a strong opinion. However, below is a Santana signed page which previously had positive feedback from this forum. Clearly, these are two different signing surfaces which may contribute to variations in size, form, etc. However, many of the signatures of shared band members look slightly different to me. I know others on this forum have more knowledge of Santana than me but I hope this comparison helps.
This has a shot of being the real deal. I'd have Roger Epperson do a quick opinion on this. It would be a very nice item if authentic.