The KOST sound, of course, is produced with big orchestration, strings, brass and a lot, a lot of effort. You can hear that instantly.
It's hard to copy that. Just using the old Coast 103-logo doesn't mean you have new KOST jingles. The Brazilian cuts are a bit poor (only synth-pianos) regarding the KOST-packages, but maybe that was the briefing of the station. Like Michael said: want KOST-sound? Go JAM!