If we are applying for a specific EN opportunity (CAERS) that's under Funding area 2, can we still list the Open Data opportunity in EN area 1, since it would be a data modernization effort too? Or should we just list the one area that is most directly applicable?

Yes, applicants are encouraged to include as many EN project opportunities as is applicable to the proposed project. Remember, however, that Funding Area 3: Capacity Building is restricted to only Tribal and territorial applicant types.