Motorcraft Rotors NBRR48 vs BRRF206

[SST]

I am shopping for front rotors at Rock Auto, and found they have two different part number, the OE design with part number BRRF206 ($70 Canadian each) and the aftermarket design NBRR48 ($54 Canadian each)

wondering anybody had use the Motorcarft "aftermarket design" version? and know what exactly is the difference?

The cheaper version is listed coated already.

Thanks