ᐅ Mattresses suitable for non-IKEA beds as well?

I need a new 140x200 cm (55x79 inches) mattress and wanted to know if it will also fit in a bed frame that is not from IKEA?

I seem to remember reading that IKEA mattresses only fit with IKEA bed frames.

Until now, I had only heard of something like this with slatted bed bases – these don’t always fit into other bed frames.
Regards,
IKEA-Freund

Centimeters are centimeters and not an IKEA invention. If the dimensions are the same, then it fits.