Some of the differences between SIA Carg o and SIA Pax are:
1. No positioning allowance in Cargo. Pax pilots get half their flying allowance.
2. No free ticket for you and your family in Cargo.
3. You get less annual leave. Cargo FO's get 28, Pax guys get 32 days
4. No transport allowance to and fro the airport in Singapore. Pax pilots get around 28 dollars for every trip and even get a limousine service during the wee hours.
Cargoboy