no. the info stored is the length of the call, whether its incoming/outgoing/missed and the date. regardless of the gui of recent calls showing only the latest call, the backup stores all the communication with that contact.
what is missing is the exact time of the call in the backed up email.
the exact time is available from the sender/receiver pull-down menu as follows:

from:
me
to:
****** <********@unknown.email>
date:
Thu, Apr 5, 2012 at 3:00 PM
subject:
Call with ***********
mailed-by:
gmail.com