You may use same set of recomm letters but you can not use the same petition letter obviously. You need to prepare a different petition letter specifically used for EB1a application.
Just for reference.
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回复:回复:请问有没有申请NIW和Eb1a用一套完全相同的推荐信,而两种都批了?
-WorthIt-
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06/13/2008 postreply
14:06:45