No, they are not.

Thrust vectoring changes the path of the thrust maybe 10 degrees but it still exhausts to the rear, aiding in forward flight (discount the Harrier please). A clam shell thrust reverser blocks the rearward exhaust flow, redirects it forward and assists in stopping the jet after landing. Deploy a TR in flight and you will crash unless the reverser tears off or you get it restowd. Thrust vectoring in flight is used all of the time, but does not assist in stopping after landing (discount the Harrier again please).

Beave