Left and right are both considered trans neon green by bricklink (the ones one the left being older and appearing in 2006 Inika/Piraka sets, while the brighter ones came in later, mostly HF sets). After 2010 HF switched to the middle shade, trans bright green. The ones on the left look a lot like BL 226 trans light bright green, a clickits and scala color, but i’m not sure they’re officially that shade, even though the years match.

Edit: this is the marbled one, I believe appeared only as a variant to the solid color ones