Are the per process memory and other statistics defined the same as the system wide stats?
Yes - the per process memory statistics and mach call counters mean the same thing as the system wide statistics.

Activity Monitor helps you break down which specific processes are making up the conglomerated statistics if you use the screens shown above. You may also find the sysdoagnose command useful in probing how the various numbers all add up if you prefer a textual output as opposed to a combined graphical and textual one.