Can you only cook on induction, or are the pots also suitable for glass ceramic cookers?

The price for the set is listed above as CHF 208.-. The same set is also offered at Galaxus for CHF 195.-. Is there a difference? Thank you and greetings

Compatibility says "induction". On the manufacturer's page it says suitable for all types of cookers. Which is correct? What is the diameter of the 4.5 l pot, important for the sieve and sealing ring? It is a pity that the corresponding accessories are not listed under the product. Thank you and greetings

How big is the content per pot?

Does it contain 2 cookers (1 common lid and 2 cooker bases). If yes, then what is the volume of the smaller cooker? Many Thanks!

Does this set also include the perforated insert and insert bar like the set with the 6.5 l pressure cooker? https://www.galaxus.ch/de/s2/product/wmf-set-perfect-plus-2tlg-650l-dampfkochtopf-8188699