"prizm black" vs "prizm black iridium": is there a difference?

[LANDOID]

Hey! I'm looking at Flak 2.0 XL on oakley.com and I can't figure out these lens options. the regular flak 2.0 XL has "prizm black" as an option, but the custom flak 2.0 XL has "prizm black iridium" listed as an option, as well as prizm grey. Are these the same? Are they different? How?

 

[flyer]

Hey! I'm looking at Flak 2.0 XL on oakley.com and I can't figure out these lens options. the regular flak 2.0 XL has "prizm black" as an option, but the custom flak 2.0 XL has "prizm black iridium" listed as an option, as well as prizm grey. Are these the same? Are they different? How?

View attachment 1125785

Interchangeable terms: They are same base, coating, and VLT. The “option” is polarization.