The Cab Guard and Sports Bar are 2 very different items as shown below.
Cab Guard is designed to protect to the cab window from the load coming through from the rear. It is a vertical barrier, built around function
The Sports Bar on the other hand is a styling bar which is designed to enhance the look of the vehicle. These are often nicknamed rollbar; however there is a clear difference between a rollbar and a sports bar. A rollbar provides certified rollover protection whereas a sports bar is purely aesthetic. 