Your best bet would be to manually set the speed of both sticks to 2133mhz in the bios and set ALL of the primary and secondary timings to Auto, or just set the main configuration setting to it's default auto setting WITH a manually setting of 2133mhz for both sticks.
Let the system train the memory and figure out what will work. It won't be perfect, not nearly as good as the timings on a pair or quad set of matched sticks, but since you've mixed speeds and models, it's probably your best chance unless you want to manually configure the primary and secondary timings that are not already set to auto, on the new stick, to match those of your 2133mhz stick.
You'll likely have far better success simply setting the speed for both sticks to 2133mhz and letting the system auto configure the rest of the timings than by trying to use any built in profiles or manually configuring timings if you lack experience doing so, which obviously you do.