Generally, if you like the stereo width and imaging qualities you are getting using MK4 in your current arrangements, you can most closely maintain those same stereo qualities with the more open MK22 pattern in a couple different ways: Use a bit more spacing while retaining the same angle between mics, or uses a bit more angle between mics while retaining the same spacing. Or a bit of both. If there is a baffle between the mics, such as your head, those angle and spacing tweaks will matter less.
Regardless, you'll get more open sounding room and ambience and possibly a bit more low end in the recording, which are differences that might be hard to parse from the change in stereo width and imaging.
A good strategy would be to start with the same configuration you are using for MK4 and see how you like it. Then try a bit more angle or spacing or both and compare, adjusting from there.