TCA9548A: TCA9548AMRGER vs TCA9548ARGER

Part Number: TCA9548A

Hello,

Can someone help with the difference between TCA9548AMRGER and TCA9548ARGER? I didn't see any mention in the datasheet or electrical specs. Only mention was a change in Oct 2015 "Added new orderable part number, TCA9548AMRGER"

http://www.ti.com/lit/ds/symlink/tca9548a.pdf

-Kyle