That ram won't be able to run very well in combination with the ram you have.
Or do you mean you don't want to add a stick, but remove the one pre-installed?
Looking your model up, I noticed it says that 4gb of the ram is soldered in. So you are running in dual channel 2x4 GB.
Open your laptop, there should be a little window you can open on the bottom of the laptop to get to your ram. If there is a slot free, you could just add an 8gb stick. That way you will have 2x4 dual channel and 1 8GB single channel. Your cpu should know how to use that effectively. BUT: get the same frequency and clock timings for that ram, I don't really know if it would affect your system if you add a higher MHz stick in single channel, but I wouldn't bet on it and play it safe.
If you don't have an open slot, just leave it as it is. Being able to run in dual channel (2x the same sticks, same GB and MHz) will give you more performance than a higher clock speed mismatch will.
Any module you install that is faster than the one you already have installed, will be running at the same JEDEC standard speed of 2133Mhz and CL15 timing of your original 2133Mhz CL15 module. It doesn't really matter what you buy as long as it's as close in spec to the original module as possible. Make sure it's the same type (DDR4 SODIMM 260pin) and has the same amount of ram chips on each side of the module. It will likely be a single rank module which is chips on 1 side.