Metro networks have phone gear like digital cross-connects, which manage high-and low-speed traffic, and synchronous optical network (Sonet) systems, which come from fiber-optic phone networks.
Cosmetically, the biggest difference between the two is the powerful 10x optical zoom lens on the 330 HS, compared to a still-respectable 8x optic on the lower-end model.
That first model includes a 42x (24-1, 000mm) optical zoom lens while the latter sports a 30x (22.5-675mm) optic -- both offer lens-based image stabilization.