Spark Plugs

[canbritsvx]

Hi all quick question, i when to a local auto parts and picked up plugs for the new car, all new vehicles i get the first thing i do is change oil and plugs.
The ones he sold me were NGK G-Power BKR6EGP , i went to change them last night and the ones in the car look new , but they are PFR5B11 , and so i checked SVX.net and the suggested plug is PFR6B-11 .
Is the 5B ok, are the BKR6EGP ok to keep and use, should i get 6B-11's
Thanks
C