Hi,
Are you in contract or staff position? because if you are in contract you will get more than your salary from Kuwait, but if you are staff am afraid less than what you have in Kuwait or the same.

Hints: mostly in contract basis they will offer you daily rate. my latest salary with Rasgas as construction Advisor was 545 usd/day inclusive... last offer i received for another project is 500 usd/day plus 7,600 usd/month for Barzan project.