Note for other readers: TOF stands for Time of Flight.
The LR200 is just a version of the R200 camera that has improved RGB resolution and a better IR emitter component. In most respects, the LR200 is identical to the R200's specification and has the same range as that cam. Its approximate maximum range is 4 m.
The SR300 is the newer of those cameras. It is the next-generation replacement for the F200 "front facing" desktop camera model. It has a smaller maximum range of 1.5 m though.
You can compare the LR200 and the SR300 through the data sheets for the R200 and SR300.
The introduction pages of the sheets describe the R200 as Infrared Assisted Stereo, and the SR300 as Coded Light.