I believe they are actually two different styles of bullets, the top ones are the Hammer Hunters and the bottom ones are the Hammer Dead Blows. Due to the bullets being solid copper the way you control the petal size and weight retention is by the depth of the hollow point and shank length. They are both doing the same thing but the petals are not shown in the top picture.
The Hunters are designed for taking big game so a larger shank size is preferred to increase penetration through the animal. The Dead Blows were designed more for varmint hunting where rapid expansion is key and penetration is not so they use a longer hollow point and shorter shank to provide that effect.
So out of curiosity why is 90% weight retention relevant? Why is 70% or even 85% not even worth considering by your requirements?
The issue is your looking at it from the wrong perspective of how those monos work. In typical bonded bullets the bullet undergoes a rapid transformation at the point of impact quickly mushrooming out to 1.5x its diameter or more. This wide nose allows for greater hydrostatic shock creating a large temporary and permanent wound cavity however it also greatly reduces the sectional density of the bullet. The purpose of high weight retention is to ensure penetration to reach the vitals with a now much lower SD due to the mushroomed shape of the bullet.
The monos work differently, rather than mushrooming out to create the cavity they are designed to fragment the nose which does several key things. One it creates a larger permanent wound cavity, those fragments expand outward creating their own separate wound tracks, individually they aren't all that impressive but together it looks like a little shotgun ripped through the vitals upon impact. The second thing it does is convert the Spitzer point into a wide flat nose, generally considered one of the best bullet designs for terminal performance. This bullet base retains its high SD due to the maintained diameter however the flat point allows it to create a larger permanent wound cavity due to the fluid dynamics of the flat nose. All of this combined results in the Hammers providing a larger permanent wound cavity that out penetrates a bonded bullet of similar diameter and weight without the risk of the bullet failing to penetrate with high velocity impacts.