Why do you think it would be any different? If the SAR crews get launched, it would be in weather the line pilots had already chosen to fly in. Exposure to risk seems identical. If responsibility depends on the number of passengers, then the line pilots should get more. Skill set seems to be the same. Perhaps there is some additional training that the SAR crews require, but not sure how much extra pay that would be worth, especially if the company provides the training.
For the CF, all pilots are on the same pay scale. The SAR guys are routinely employed in operations and get nothing extra. Other communities sometimes get extra when they're doing operations, but that usually includes increased threat levels.
Matthew.