Absolutely it's a better design with different parts front & rear. But it's still technically possible for them to be the same, even when mixing IFS & DeDion. I doubt this has been done by a manufacture in the last 80+ years though.
FWIW: spring/damping rates are only a piece of the equation...
Depending on how it's designed, a De Dion suspension could use the same struts as the front suspension.
Related:
Why The Slate EV’s Unconventional Rear Suspension Makes Perfect Sense
https://www.theautopian.com/why-the-slate-evs-unconventional-rear-suspension-makes-perfect-sense/