I have bajaj vikrant v15 , its rear shockers are stff even in soft settings, can i replace them with bajaj pulsar 220 nitrox shockers

***I have bajaj vikrant v15 , its rear shockers are stff even in soft settings, feels like sitting on higher level ,not comfortable riding on bad roads and long distance, and feel bad on my back. can i replace them with bajaj pulsar 220 nitrox shockers as they seems working well on similar conditions. ( pulsar 220 shockers are 13 inches in length and v15 are 14 inches)