Can anyone tell me the difference between Hornady Black 12 guage 00 buck and Hornady Critical Defense 12 guage 00 buck?

Their website is surprising devoid of details.

And every website I can find doesn't say much about the differences in Hornady product lines.

Does the Black have the flight control wad for tighter groupings that the Critical Defense does? (Or whatever Hornady calls it)

I like Critical Defense 00 Buck. It patterns well in my shotgun better than Federal. And I'm good with the recoil it packs I'm just wondering if Black is basically the same thing because I found it on sale. (sgammo has it at $1.50 per rnd)