Yes, in hindsight, that was a dumb question, as it is a symmetric molecule lol.
Upon further investigation, what is important to take home from this is that while it is true you can characterize the hybridization as sp2 for both nitrogens, antiaromaticity is a destabilizing effect. So if the system can prevent proper orbital overlap to hinder the antiaromatic resonance, it will. The most famous example is cyclooctatetraene, it would be classified as antiaromatic, but it adopts a "tub" conformation that prevents the correct overlap.
Just like in the dihydropyrazine, if one of the nitrogens "stays" sp3, it prevents the overlap and the antiaromatic character from being as prominent. The furan however can be sp2 and become more stabilized by aromatic resonance.