Where can I find a root for my Samsung Galaxy S3 sgh1747m?

[AC Question]

root samsung galaxy s3 sgh1747m

Hi
I am looking at this url - androidxda.com/root-samsung-galaxy-s3-sgh-i1747m
It indicates this method is ONLY for the following build:
kot49h1747mvlufnh2
My build is:
kot49h1747mvlufob1

Does anyone know where I can get the firmware for my build; or should the "last 3 characters difference" of the builds cause me concern?

Thanks
Marty