Hi Rorschah,
They share some common features, but they are actually different designs that were designed for different markets and evolved independently.
The Delica is more of a mainstream market design. A do everything design that should serve the majority of the population's needs for a 3" locking, safe, reliable, high performance folding knife.
The Caly3 is geared more towards the aficianado ("afi's"). features like finger choils that let you get closer to the edge are a feature that fewer appreciate. features like wire clips, likewise.
Both models were designed, and continually refined with and for the customers that like or want specific features.
sal