On the Note 3 N900w8 users got lucky, they could downgrade to JellyBean and back to Kitkat without issues, could root (on JB) without tripping KNOX and can pretty much flash ANY international ROM on their device (in this case the N9005 ROMs, N900T ROMs etc) -- IT is possible, now I use this term very very loosely that you *may* be able to flash a whole lot more than w8 only ROMs.
// LG G3 (D855) // Stock // Stock //

// HTC One (M8) // GPE Stock // Stock GPE//

// Nexus 7 (flo) // Android L // Stock//

S3(White) > M7(Red) > Note 3(Black) > Nexus 5(Black) > M8(Gunmetal)/LG G3 (Titan Grey)