How can I have CKEditor instances that have different sizes or different configurations?

How can I have CKEditor instances that have different sizes or different
configurations?

I have set up the size of my CKEditor window as follows:
CKEDITOR.editorConfig = function( config ) {
config.height = 350;
config.width = '100%';
};
But I would like to have more than one size. A large and a small size.
Can anyone tell me how I can change the size so one instance is different
from another.