Those are very cool.
I have a full set of the Sega Hot Wheels from a few years back, but the classic Namco games are definitely cooler. I think my biggest problem with licensed Hot Wheels and Matchbox is that they just slap artwork on almost any car. Shouldn't the Pole Position car be an F1 car? I also would have expected Ms Pac instead of Galaxian.
The Sega ones were fairly well done and featured many of their popular games at the time. They were:
Space Channel 5 (#110) - Fandango (HW original)
House of the Dead (#111) - Chrysler Phaeton
Shinobi (#112) - Lotus Esprit
Super Monkey Ball (#113) - GT Racer
Jet Set Radio Future (#114) - Custom Cougar
HERE is an auction with them. Here's the picture from the auction: