No, it wouldn't have to hold for every device, only those that have different SKUs for different regions. Maybe the EU Note3s have some tweaks for the LTE bands in use there or vice versa.
Either way it might also be a purely legal thing, by having the sticker they indemnify themselves from the FCC saying you can't sell this for use in the US because it isn't certified.
People always jump to crazy conclusions when there are much simpler explanations that don't involve companies shooting themselves in the foot. Samsung as a brand is killing it in the world in general, they have no incentive to do something like this.
Either way it might also be a purely legal thing, by having the sticker they indemnify themselves from the FCC saying you can't sell this for use in the US because it isn't certified.
People always jump to crazy conclusions when there are much simpler explanations that don't involve companies shooting themselves in the foot. Samsung as a brand is killing it in the world in general, they have no incentive to do something like this.