here's my comparison of xiaomi ORI and KINGMA waterproof case
left : xiaomi ORI xiao yi case
right : KINGMA OEM xiao yi case
click the img for bigger pic.

here the packaging of both, obviously you can see the different of ORI case having proper cardboard packaging with the YI wording, and KINGMA case pack inside ziplock bag.
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the screws and adapter which is included with the case
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a close up shoot of the front, most recognizable difference are the lens' shape. ROUND vs SQUARE.
as for the branding on top, xiaomi's with "YI see difference" and KINGMA's is so obvious aldy.
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comparison of the power,shutter and wifi button, ORI case button are plastic made and KINGMA's button are metal
IMO, KINGMA's button having better tactile feedback compare to ORI case and ORI case button need to press hard and deep only it will clicked.
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both looks the same from the back after the case are opened.
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xiao yi fits in perfectly for both the case
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summary:
basically both case perform the same, only minor differences in outlooks.

color option and outlook:
ori - currently only offer white, round lens
kingma - green & white, square lens
it is easier to color match your yicam with kingma case

build quality:
overall both built are quite rugged, only diff are the button's build.
another thing i read from xiaomi china forum are the lens of ORI case are made from gorilla glass 3, nt sure how true is this

price:
from wat i seen in garage and other online site
ori : rm90+
kingma : rm50+