Does a subsequent crossing restriction supersede earlier crossing restrictions?
Here's an example.
While flying the MIP4 arrival into KLGA, you receive the expected instruction to cross MARRC at FL180. Before reaching MARRC, you receive the instruction to cross BILEY at 13,000. These fixes being expected is not material to the example. The question is, when given the subsequent instruction to cross BILEY at 13,000, does this supersede the instruction to cross MARRC at FL180.
If possible, please cite answers in 14 CFR, AIM, or another FAA source.