/BR is a retail (BR = Buffalo Retail for Select-branded modules) package that contains memory with a /BJ (BJ = Buffalo RoHS compliant) part number. These modules are JEDEC compliant and should work in most Macs. However, they are not tested in Macs.
Our TechWorks brand, are designed for and tested in Macs. TechWorks brand will rarely have issues in Macs, due to the extended testing for compatibility in Macs.