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其实是收到4 个Approved Notice，

主申请人（EB2）有2个 Approved Notice，COA:H1B 和 E26

次申请人有2个 Approved Notice，COA:H4 和 E27

这些有什么区别？

-E26 and E27 are the green card categories, respectively, for professional holding an advance degreen or of exceptional ability (i.e., EB2), and spouse or kid  of an alien classfied as E26 (i.e., EB2 spouse or kid), etc.. 

去申请新的SSN时需要用哪个COA?

-Have you received the physical green card yet? If no, just wait for the green card. After you receive the green card, bring it to the lcoal SSA Office to update your SSN card.