ETOPs and MNPS are 2 completely different areas which may overlap or be in conjunction with one another.
For the 787 for our operation Required Equipment for MNPS, An aircraft must be equipped with at least 2 Long Range Navigation Systems meeting certain accuracy and reliability requirements.
In order to operate in MNPS airspace, the following equipment needs to be operative
1 IRS
1 FMC
1 CDU
1 GPS