What's the difference between Verbatim old azo and new azo?

The currently available Verbatim DatalifePlus Azo looks pale blue. Verbatim Azo from ~16x days had deep navy blue recording side.

Anyone know if there’s a substantial difference in chemistries between these?

Err, we talking DVD here?

Sounds like CD-R to me. Metal Azo was used in the 16x days. I quite liked it. But now the Datalifeplus is Super Azo and looks far more greenish in colour.

There would be a substantial difference because one an be written at a wide speed range and Metal Azo can only be done at lower speeds.