I accidentally ordered a TCL Roku TV remote instead of the one for my Roku 3 :? so my question is will I be able to pair this TCL Roku TV Remote to my Roku 3 device(or any other Roku device besides the TCL Roku TV) or do I need to move on and purchase a new one specifically for my Roku model?
More than likely you bought an IR remote. You will be able to use it with the Roku3 but you will have to point it at the device. There is no "pairing" for IR remotes, if the device can see the signal from the remote, it will work.
Note that the Power and Volume buttons on the remote likely will not do anything.