In Pursuit of Valis vs. The Exegesis?

[Winslow T. Schiller]

Hi all:

I own the original In Pursuit of Valis: Selections from the Exegesis (ed. Lawrence Sutin; 1991) and wondering whether to buy the much newer Exegesis (ed. Jackson & Lethem; 2011). Is there substantial cross-over of material, or is the new version really new? Thanks. - WTS