"new" worker abs flywheels?

Hello everyone, I'm hoping you all can school me on the newer Worker abs plastic flywheels. I currently use the older white concave vertical toothed Worker flywheels in my stryfe and love them, but am curious if there is a difference between the older white one and newer black abs concave vertical tooth worker flywheels other than color? Also noticed you can get the black abs concave worker wheels with either vertical teeth like the old white ones, or with diagonal teeth. What if any differnce would vertical teeth vs diagonal teeth have?
Are the newer blcak abs wheels as light as the older white abs wheels?
Please school me on these wheels.