Double submission - Will it have implications on on the visa ?

Hye all I have a situation where i have two job opportunities now.

The first one is one of the Adnoc's subsidiary. I went interview on mid february 2013 and has been informed through email that i am selected and they are proceeding with government processess. And they asked me to await for their call. No contract being signed yet...nothing black and white except via email correspondences.

Now, i have received an invitation to attend f2f interview wf one national oil and gas services provider in abu dhabi this april. And i have not told their hr yet about the 1st one.

My concern is, if the 2nd company decided to hire me, of course they will go through the same process as of company no 1. So what will be the implication on my side from the government approval's perspective (visa application, security clearance)

If they found out there is double submission, would they reject as on whole? I dont want to be face risk of loosing both while perhaps i have one in hand already...in my case, off course i would go to the highest bidder...and first come first serve... Would appreciate any feedbacks. Thanks in advance.