The Ducky G2 Pro has been discontinued for a while, and if you want to stay Ducky, the closest thing available would be the Ducky One. However, I don't think there is a Ducky One with that color keycap.
I think Leopold keyboards might have those color keycaps if you want to check that out.
Also, PBT is short for polybutylene terephthalate, a type of plastic used to make keycaps. It has a textured feel and is less prone to wear and shine over time. PBT also is denser than your average keycap, affecting perception of quality and typing sound. This is in contrast to ABS plastic.
ABS is the more common plastic used to make keycaps. It is prone to wear and shine over time and from most manufacturer keyboards, is typically thin and low quality. There are ABS exceptions such as GMK Keysets, but if you're only looking at manufacturer keyboards, ABS tends to be less favored than PBT.
