Would Wargames Atlantic Dark Age Irish work as Gallic Celts?

Obviously "dark age" is in the name and I know that came well after Romes campaigns against the Gallic Celts. I'm just getting into learning about Rome and some buddies want to get into hail ceaser. I'm not overly excited about the warlord sculpts for the Celts. I already own a box of Dark Age Irish. Given a cursory glance I don't see all that much difference in gear between the warlord kit and the WG Atlantic kit besides shield shape. Unfortunately I've already built them with shields for when we got into lion rampant a few months back.

Now my buddies won't care if they are historically accurate. However I'm one of those people where it will bug me knowing if they are way off the mark, lol.

Any help is greatly appreciated!