Mazda oem part number?

Hi guys i wanna replace the brakes on my 2015 Mazda 6 with OEM Mazda brake rotors and pads. I noticed that in general some Mazda Parts No. Have A or B at the of the part number. Does this mean the part has been revised?
Update: Hi guys i wanna replace the brakes on my 2015 Mazda 6 with OEM Mazda brake rotors and pads. I noticed that in general some Mazda Parts No. Have A or B at the of the end of the part number. Does this mean the part has been revised?
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