The 2 (two) Splinter which unique than the rest is the Dragon and Neutral Splinter. I'll cover them both together because there are only few addition of them compared to the other Splinters.
Peakd : @kid.miniatures/rebellion-rewards-overview-dragon-and-neutral-splinter
X : https://x.com/kid_miniatures/status/1878205712746295400?t=JVlrprMmMNSKmjSwo8pwdA&s=19