2004 Mazda 6s Wagon ATX
Hey there, it's tough to say. With anything else I would say nah, but the electrical is what changed during the facelift.
I do know a lot of things (most really) are plug and play between the two sub-models. The only real significant differences I have come across involve the BCM. If anything, I would say the only real changes would be some of the wiring colors, but otherwise I would bet an appendage (albeit a small one) that it will fit and work fine.