Both .pcg and .ksf files are audio samples / sound banks from Korg Triton, so it's safe to assume direct pcg to ksf conversion is doable.
What you need in this case is to find a tool that supports Korg Triton files, typically audio editor / workstation for music composition. Dedicated audio sample converters, such as Translator, might be a viable alternative as well.
Updated: January 2, 2024