don't they only share the DCi engine as it's renault the CR and HR engines are nissan.
it was posted before that NMUK put a 172 engine in a k12 for testing, didn't handle and sales for 2.0 litre micra were not worth the effort.... apparently....
i'v removed a engine from a 172 and yes i think you could fit it most of the bits fit i'v got the rear brakes and all of the suspenson off one . the front struts tops and the antiroll bar links you need to modifey tho