Hello @Cheroo, and welcome to the forum!
Krita’s brushes don’t work in Procreate and vice versa, at least usually. That was the bad message, the good message is, there is something in the works that can tear the wall between the programs down.
But that will not be a full conversion, it will only be as near as technically possible: WIP Brush Conversion Scripts: .brush, .abr, .sut to Krita .kpp, so far I have not tested it, but it is at least a neat idea that may help users to adapt brushes they love as good as technically possible to Krita. If you know, that not long ago this was considered as impossible, then you may understand how great it is.
But if you think you can only achieve something specific with brush XYZ, then this statement is inaccurate in well over 90% of cases. You simply haven’t found the brush in Krita that offers exactly what you’re looking for, or that offers what you’re looking for with minimal adjustments.
Furthermore, the artist and their ability to use their own tools are important for most of the appearance of an image, otherwise there would be no masterpieces by artists who work exclusively with one or at most two brushes. In their case, an image is created from the skills of those who use a brush; the brush itself is secondary.
Michelist