35M / Diploma / 12YOE currently in SB / Snr Exc

I applied for a Manager position in another SB under different Ministry. Application was accepted, tmr will be going thru interview.

My current scheme is Grade 6 and I assume the position I’m applying for is the MX scheme MX12? MX13? Offering $4.5k - $5.5k (according to job postings). What are the chances of me getting offered as the salary stated above though my current is only $3.6k?

With regards to “movement policy”, new SB might offer me to retain my current 21days AL & yrs of service. Does it mean that the salary offered will be the same as previous gross pay?