You cannot drive a saloon car with C1 NTSA driving License in Kenya. That is a different driving class. Just go back to a driving school for endorsement if you want to be at peace with the police when travelling.
Here is what the traffic act in Kenya says’
“No person shall drive a motor vehicle of any class on a road unless he is the holder of a valid driving licence or a provisional license endorsed in respect of that class of vehicle”
It continues to state that
“No person shall be entitled to more than one driving licence, but a driving licence may be endorsed to permit the holder to drive one or more classes of motor vehicle.”