Can VST synchronize VST live through a device like the Korg Kronos via Midi?
U mean via MIDI CC? Yes!
New MIDI track, and open MIDI list editor (not the one below - the piano roll - we used to use, but from dropdown), add the needed values to send to Kronos
If you talk about transport (time) synchronisation, VST Live can send MTC (Midi Time Code) as well as Midi Clock, but will not sync to incoming MIDI. Sync to MTC is planned for later.