As far as I know all brakes except for 2016 are the same. Just different manufacturers and functionally equivalent. It is a commodity. All will fit and will work the same. Generally you want to replace all the brakes on the same axle.
Here are all the choices for your year and rear from RockAuto (they ship internationally)
What you're seeing is the pad shape designation. That is the original creator of said pad specs. On the CR-Z the front pad was originally a Akebono but the rear pad is Nissin and has been around since 1992. They use these specs since that's what aftermarket companies will make the pads from, like a blueprint.
That is pure opinion nothing else. Better why? As long as they meet or exceed the specifications by the manufacturer they are fine. Specifications matter more than brand or manufacturer.
There are many companies world wide that make quality brake pads. That just happens to be who made them that time. Anything that is private branded can be made by any supplier at any time and can change depending on when the batch was ordered.
Brake pads are a standard wear out item and are a commodity available from many sources at many different price points. The main thing to remember is to replace them and the rotors when worn below specifications as this is a safety item.
What is next we have to buy Honda branded washer fluid? GM used to tell people they had to buy their Optikleen washer fluid.
Specifications matter more than brand. These are standard replacement parts.
If it were not for the Magnuson–Moss Warranty Act we would be required to buy all replacement parts from the dealer to keep our warranties valid and we would spend much more money on parts.
Aftermarket or alternative supplier parts are just fine as long as they meet the specifications and are made by known suppliers. Some aftermarket parts exceed the specifications by a lot this is especially true for Brake pads. It is good to have choices, your attitude represented by your post would reduce choices and is based on pure opinion.