The contents are different with some overlap, for example, USB Complete has one chapter about embedded hosts, and USB Embedded Hosts has a chapter that introduces USB.
I would say that an understanding of the first chapters of USB Complete is helpful in understanding USB Embedded Hosts.
More information about the books is here:
http://janaxelson.com/usbc.htmhttp://janaxelson.com/usb_embedded_hosts.htmAnd yes, USB Complete Fifth Edition, like all of my recent books, will be available in print, Kindle format, and PDF.
Thanks for your interest!