there is a lot of adjustment available in the composer, not necessarily available in other manufacturers style systems - and vice versa.

so a conversion can only come up with the notes used in each track, pretty well balanced if you are lucky, with a sound hopefully close to that of the original.

since other keyboards have other sounds, and a style is played with an original voice, a conversion will sound slightly wrong in the same way that your sequence that sounded fine on an older keyboard does not sound the same on a newer keyboard, even though the sounds are much better. You tend to play taking into account the feel of the voice - if the attack, decay, brilliance or richness has changed, the feel will also change.

that's why you pay for professioanly produced disks, a lot of work and tweaking has gone into them to produce a fine style sound rather than just an average one.