Same brand aftermarket does not guarantee that's its factory spec.
+1
For example:
A Factory Michelin PS2 tire for a Viper,
A Factory Michelin PS2 tire for a Porsche,
and A Michelin PS2 tire purchased off the shelf(or online)
are all different because apparently some manufactures have the connections to have a unique spec tire produced to be equipped on new vehicles.
Also, i remember when reading through all of our SRT chat sessions there being comments by the engineers talking about working with diff part manufactures to create "viper spec" parts.
Say XYZbrakes makes aftermarket brakes for many diff vehicles(including the viper) all using the same compound,
and then later, SRT works with them to create a specific compound for the viper to be supplied OEM.
Then some time down the road you are due for new pads,
You read on an internet forum that OEM uses XYZ Brake Pads,
You go to the XYZ website(or ebay/amazon) and order pads.
What is delivered to you might be the generic spec compound rather than the OEM spec.
If you had purchased from an OEM suppler(dealership/VPA/partsrack/ect...) then you would be guaranteed to get the good stuff.