I don't understand the question. PCM is "real" samples. In addition the Kronos has a whole bunch of engines that don't use samples at all. What do mean "how Korg made sounds"? The programming?
what I mean Kronos samples are digitally looped and created
Not real sampling form real instrument, like violin is not real one but digital shaping of a wave sine or what ever,
am I correct ?
The Kronos has nine different sound engines. Five of those use samples (recordings from a real instrument) in some way or another. Sometimes those samples can be looped after the attack portion, which is pretty normal. They're still recorded from real instruments and not generated sine waves or whatever.
SGX2, the piano engine, uses entirely unlooped samples. HD1, MOD7 and STR1 can use unlooped samples, but many of the stock samples use loops.
The Kronos has nine engines. The HD-1, SGX1 (and SGX2 engines) of which have real sample material, the SGX engine even unlooped material from a real german grand piano for example.
The other engines calculate their sounds in software in real time.