Hello Leosomemore. Since Ikea unfortunately does not give any information about the pin diameter, you would have to take a castor off and measure the pin diameter yourself. If this is also 10 mm, as with the Topstar castors, then they should fit (emphasis on should).
If I were you, I would ask the Ikea customer service to be on the safe side. They are quite helpful and competent.
On the other hand, you also have a right of return at Galaxus and could therefore also return the castors if they don't fit. :)
Kind regards