Can Preference of an approved I-130 change from F2B to F1?

[nidhij]

Hello,

 

I have an approved I-130 and my PD is August 2010. My parents filled my GC, they now want to apply for their citizenship, assuming they get their citizenship, would that change my approved I-130's preference from F2B to F1? 

 

F2B's PD is 15SEP08 and F1 is 15AUG07, please confirm is there is any impact on my applications preference category.

 

Thanks!
NJ