Here are the latest figures for a New-hire Captain. It looks like the original joiners get a little more than the new guys in all the pay areas but not 12-13% less more like about 5%.
Captain:
Salary per month
Value in AED
Basic salary
25,225
Housing allowance
14,000
Transportation allowance
2,300
Variable Flying Pay *
(based on working an 80 hour month)
12,800
Projected Total
54,325