Rocjwool knows several divisions:
Building, Industry, Roof, Acoustics, etc.
Rockfon became a daughter company (don't know how the juridical relations are anywhere).
The material comes from the same factories.
It's a matter of marketing specific products to specific markets.
Some products are even equal over different divisions with there own prices adjusted to their market. Only the Rockfon versions always have some finish.
You can perfectly use Rockfon products.
The important thing is not to stop questioning. Curiosity has its own reason for existing ............... Albert Einstein