The Progen 80 chips are 10g injection-molded china clay, and are generally considered to be near the bottom of the barrel quality-wise when compared to other china clay chip offerings. They were sold with various label designs and as blanks, and used a interlocking reverse-J mold greek key style with 4D14 spots, emulating the style used by Paulson on their Classics line (and others). The mold actually copied the Palm Gaming interlocking reverse-L greek key mold, after PGI and their original Chinese manufacturer parted ways.
The NexGen Pro chips are 9.0g injection-molded abs plastic and are a much more durable chip than china clays, but they also lack the material components that provide 'clay-like' characteristics (feel and sound). They are quite slippery, and pretty unstable in stacks. All Nexgen Pro chips use the same arrow-P mold and were sold with 'Classics' labels and as blanks, although there are several similar chip lines with theme-specific mold variations and matching labels (four military versions, Pioneer Club, Desert Palms, Dunes Hotel, etc.). All of the different varieties share the same colors and 4TA38 spot pattern.
Neither chip has a metal insert, but they both look and feel completely different. Mistaking one for the other is impossible. The chips in your photos are Progen 80s.