I eventually chose not to go for the through ticket from SML-ASR. I had, by then, decided to do SML-KLK by 2S(which costs Rs. 35), so I booked a through ticket(3A class) only from KLK to ASR via UMB. The enquiry I made at the PRS counter about the SML-ASR through ticket was purely to clarify my above doubt. :)