1) should be no problem to load C patches into a TI (since it got more features, not less).
soft knobs are often not assigned when doing so.
the other way around would be definitely more problematic.
2) dump them as MIDI file - so you can later directly load them with Virus Control.
SoundDiver dumps are not supported by VC ...
http://www.infekted.org/virus/showthread.php?t=24159
3) they should sound quite the same, never had a chance to compare.