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i doubt it. but what you can do to find out if OEM brakes for RX is the same part number as OEM brakes for IS/GS. If the part number is the same, then it's possible that the BBK will fit on the RX. assuming there is a BBK application that fits, it doesn't mean it will fit your OEM wheels. you may need to go with aftermarket wheels that has the clearance you need. good luck.
i highly doubt it. if anything i guess the rx and es brakes would be similar. someone tried both my ls460 and gs350 brakes on his es350 and they aren't even close