Keystone jacks fit in keystone plates from most mfgs. However, there can be a gap/spacing since they are not engineered to fit together.
There are other mfgs who makes jacks that are not keystone style (Ortronics, Siemon, etc.). You will need the faceplate made for these types of jacks in order to make it work.
The best practice is to use the properly matching jack and faceplate.
