As I understand, you could use the EB2's PD for a EB3's I485, but hard to say if you can use the EB3's PD for a EB2's I485 upon approval of both of I140. In the PERM time, the PD of EB2 might retrogress too. So PD is important. Another issue is Ads and procedure for recruitment that is painful generally except some ...
By the way I am not a lawyer either.
By the way I am not a lawyer either.
mvinays said:What are the financial implications of re-applying PERM?
What does it do to the priority dates for 485 processing?
You can use the new approved LC (approved via PERM) and apply for 140 and get the 140 approved. Meanwhile, if your old LC gets approved by BEC, you could do something called as "substitution of priority dates". This means you will request USCIS to use your earlier LC's priority date to let you file 485. (I came to know about this by talking to the same reputed attorney again. This attorney mentioned that most people are not aware of this trick which can be used lawfully.). This substitution will need to be done at the 485 stage when you send your application packet to USCIS.
Again, the above answers are based on what I know and what I have gathered from my own research.