Anyone has any info on the salary scale of being a FSO in MFA? Considering all things equal, do those in the FSO (political/ economic) track get the same as those who go the FSO (functional/ corporate services) track?

My back ground:

gender: Male
age:29
qualification: NTU Mechanical Engineering (2nd upper class honours)
Working exp: Still in my first job out of graduation, 4 yrs in a GLC doing engineering.

The HR called me up for an interview next Monday but informed me that after looking at my current pay, I would most likely have to take a pay cut. Any idea what the amount would be like? I'm currently drawing about $4.5k a month excluding bonuses.

Thanks in advance.