Zenki and chuki bumpers and fenders are interchangeable, with the exception of minor differences in width. The chuki bumper and fenders are slightly wider by 10mm or so. They will bolt in with zenki parts, but there will be a gap between the bumper and fenders, depending upon how you mix them.
Not a big deal really. If it really bothers you that much you can get fender extensions for your zenki fenders to get them flush with the chuki bumper.
You can see the gap here. This is a chuki bumper on zenki fenders. The gap isn't noticeable unless you stand right next to the bumper.
