It is expected if you long enough(tired) with Bandai marketing
color swap = 80% for Premium release
some thing difference = 50-70% for Premium release e.g. MG Banshee Norn, MG Crossbone X2
old kit remold = 90% for Premium release, included color swap or minor thing added
I purposely dont put the P-Bandai because most people know how the thing turned out
Geara Doga = Neo Zeon Sleeve wrist emblem
Zeta+ = Color different and plus added minor thing on forehead (I dont famillar with old MG Zeta+ A1 so might be some mistake there)
Edit: seem like new Zeta+ A1 Unicorn have different rifle design compared to old Zeta+ A1
Understandable Pbandai cos almost similar kit surely hard to sell out if product in mass.
But yet shinaju got 2 ver.. Hahaha