Its a lot worse. Ancient Nordic is better than Ancient Falmer.
Your joking right?! You really must not be improving anything at all! With full light armor perks, my BASE is 108. Then I upgraded it to almost 600.
Plus...
Ancient Nord Armor Base Rating - 25
Ancient Falmer Cuirass Rating - 38
That means it is equal to GLASS armor. And for the topic starter, the base is only 8 points behind Dragonplate, so assuming you have equal training in both skills, it is slightly worse, but really - it is light armor, and just as Dragonplate is second best heavy armor, glass armor (equal to Ancient Falmer) is second best light armor, so it should be fine. Assuming you have a decent Light Armor skill and accompanying perks.