I think it was that they worked with Jescar. And they did Menzerna USA and Menzerna had theirs. But was offered together and it was not so simple to figure it out in the first place. Then with the renaming they offered the old bottles for a long time too. Now I think they are down to 3 compounds and 3 medium polishes and 3 finishing polish and 3 protection products. And if you dive into those they are not so hard to seperate.
1000 and lower you have the compounds with different characterictis.
2000 you have the medium polishes also with a little difference between but each has it's benefits on different paints.
3000 the finishing polish with also the difference between them.
They have tried to simplefy them with the old system 1 step 2 step 3 step. And there is where it's get a lot of confuseing. As the new abrasive technology you often don't need 3 steps to correct it to a show car finish. Both the medium polishes and compounds has gotten a wider range from a high cut to a high gloss. Then you have the difference in the hardness of the clearcoat to handle too. They have their own pads also. And they are color coded to each step.
Red compounding pad.
Yellow medium cut polishing pad.
Light Green finishing pad.
Blue wax pad.
The One step 3in1 is outside of the system. But they have a type of you can call a jeweling sealant. They named it Power Protect Ultra 2in1 and is a finishing polish like SF3800 with a sealant protection in it. So no real cleaning in it but to cut down the finishing and protection step to 1.
I could stop rambling know and just give you a link to look at that sort it out. And if you look at other brands they have different series of their polishes. If you want to try out Menzerna you can start with 3 different products that gets you a long way. And if you need something more out of one of their products you have that option too.
Start kit would be IMO.
Heavy Cut Compound 400. (HC400) Cut/Gloss 8/8
Medium Cut Polish 2500 (MC2500) C/G 5/7
Super Finish 3500 (SF3500) C/G 3/10
Cut 1-10 and Gloss 1-10 scale they uses.
Know to complicate all this together. You can go from SHC300 with C/G 10/6 and finish it of with SF3500 C/G 3/10 and Powerlock to seal it in

And this is with their foam pads Red and Green and Blue. You can get alot of different combos now days, when mixing pads and polishes and also if you where to mix in the different brands too. Ohh man my head gets spinning. But if you where to find your polishes and pads that works for you. They often goes over different brands. But you can do it as simple as possible for your needs. And with getting that little extra out of something is a trial and error testing when you stumble on finicky paints.
Car Polishes | menzerna polishing compounds GmbH & Co. KG
Sorry for the more confuseing descriptions LOL.