Hi,

The permissions are granular however, in this case you may need to use two sets of web parts - in the web part you can set "Display to roles" property or just simply use the "Visible" setting and use appropriate macro which will check the current user and return true/false so the web part will be hidden.

What I meant by two sets of web parts (or more) - I meant that one web part will be displayed in case A and second web part will be hidden and for the other set it will be vice versa.

I hope it makes sense.

Best regards,
Juraj Ondrus