Maybe, maybe not. LPC10 is a 8kHz speech codec optimized for low-bandwith signals. The Kelley-Lochbaum is a full-blown physical model of the tract.

What you put into the filter is important. The LF glottal pulse model used here is a pretty good excitation signal... aspiration noise REALLY makes a difference. It would still sound artificial, but it definitely wouldn't sound metallic.