Not exactly so. Also for "consumer" or "recreational" skis they have different stiffness. But stiffness depends on length. This means that super stiff skis at 170cm are softer then soft skis at 190cm.But in recreational skis, skis don't tend to come in different stiffness. So is flex reflected by length? The longer the stiffer etc.? However, that wouldn't account for the height of skiers. Heavy but short skiers would end up with long (= stiffer?) skis they have trouble going up steep hills, wouldn't they?
What about different models? Are the more "entry level" skis softer than the "higher" level skis? Does that muddling up the water between length and flex or what?
Or is my understanding too simplistic and still missing some important nuances?
This is first Fischer catalog I found, so hopefully it will work for you. If you look at page 49 you will see tables with ski model, ski length and skier's weight:
Workbook 21l22 Nordic EN
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In these tables, you can find appropriate length and stiffness for all Fischer models, so yes even lower end models have different stiffness (page 50 and 51), but there stiffness really depends on length so you don't have soft, medium and stiff model of same length, but you pick right length for certain weight. I'm sure other manufacturers have similar tables available.
As for different models... talking about Fischer again, but you asked for that anyway Speedmax and Carbonlite are their race skis. They are two different models of race ski, and they are meant for different condition so their flex pattern is different (not talking about ski stiffness for different weight now, but how ski flexes when on snow and where are main pressure point toward snow), and also their construction is different. Personally for recreational skiing I would always pick Speedmax, but for racing you need to have both (like 20 pairs of each ). Plus and cold is just for what they are meant. Different ptex, different construction and different flex pattern for cold snow and for warm snow. But in general plus is best option, as it works fine down to -10c, and most of time normal people don't ski at -20c where cold skis would work better. So nowadays most of my skis are plus.
RCS Skate Plus is wannabe racing ski, but in reality it's recreational ski with look of racing ski. Slightly heavier, a little bit more stable, worse ptex, but with hole in tip it still looks like race machine. And I just saw it last week on track, 2021 model all in black looks pretty damn awesome