I am guessing that since there is a difference in Stage 1 , 2 , and 3 part # for 10 , 11 , 12 , I am thinking they changed the decompressor system on those years , as I seem to recall there being issues with it in 09 , and they also changed around the valve sizes ... so I am thinking they don't interchange , or at least not all the years , I am sure the heads will bolt on , but I would guess you would have to use all the components to match the given years , as the Honda Service Manual I have goes from 09-11 , but not 12 , so there must be at least a significant difference with it compared to the 09,10,11 ... but I am not positive .... HotCams would have the insight to those specifics , it seems All Balls Racing Group is in control of HotCams , so you might contact them directly for the specifics to that , as that is beyond my insight , and ask them if they do interchange and if so is anything special needed , as like I mentioned , Tower , etc. as there is usually a reason behind it
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