Duster vs Dart Sport front grills

Also, I gather that this had to do with the limited lifespan of the tooling.

They could either invest tooling that would last several years or refurbish/maintain the existing tooling...or just come up with all new stuff and enjoy the marketing benefits.

Very true, I like the think the engineers and designers at Chrysler were just always trying to come up with something Kick *** for the next year!