There isn't anything noted for either of the lounges at EWR, but at AMS there is a note of their peak hours during which Priority Pass members may not be admitted. Admission policy, including guests, is established by the individual lounges, not by Priority Pass or Chase:
Thanks, I noticed the AMS time constraints. Our flight is around 3pm so we'll be gone by 4:30pm. Probably won't get to the airport until 10am or so (coming from a cruise).