The Dream Machine goes a lot more in depth and covers more of the story.
it is quite a long read, but is very good.
but from reading the 'dealers of lightning' it was kind of apparent, that parc had a huge influence on development of internetworking-protocols than is widely known f.e. we must surely remeber about the 'parc universal packet' aka PUP (https://en.wikipedia.org/wiki/PARC_Universal_Packet) as a precursor to the much beloved tcp/ip protocol suite etc etc.
unfortunately, i didn't really enjoy the 'wizards' book as much as i would have really liked...i had the distinct impression that it was kind of 'jumping all over the place'