GPS location using 2 receivers - Are they the same?

hi,

goal:  have 2 robots, both gps.  want have them driving randomly outside, , have robot send gps coordinates robot b.  robot b goes robot is.

i want know if put 2 gps receivers next each other, register same coordinates?  (i know gps devices have error associated it.  i'm curious if coordinates same, register same error guess irrelevant?)

yes, know best way them , try, i'd see if there know answer before invest $100.

here's example of device i'm thinking of using:

(ground robots)
http://www.adafruit.com/products/1272?gclid=coykncfnkr4cfemsogod-t8apq

(uavs)
http://store.3drobotics.com/products/apm-2-dot-5-plus-assembled-set-top-entry

will outcome better if both brands same, or not matter?   because otherwise, may want use 1 shield, , 1 gps module on breadboard uno robot come me:
http://www.superdroidrobots.com/shop/item.aspx/66-channel-ls20031-gps-receiver-module-mt3339-chipset/1647/

i've compared results of using gps receivers different manufacturers @ same location, , have seen small differences between reported locations (a few meters). guess identical receivers report identical values have not done experiment. should , tell happens!

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