A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 5 June 2007
Can you play 2 unique cards if they're different xp levels and not overlay. I have Air Dragon out and in my province there is the xp2 version, do I have to overlay or can it come out as another personality and I now have 2 Air Dragons in play?
[Mod edit: Thread title. Please make them descriptive! -ZF]
Zen Faulkes (rules official), 5 June 2007
Can you play 2 unique cards if they're different xp levels and not overlay.
Generally, no. The one exception: Rules Archive, Experienced: "Experienced cards with different titles do not cause a Uniqueness conflict with each other."