Any advantage is in the eye of the beholder. Both are rated 18HP. I did the swap from a Kohler Series II 18 to CH18 because I already had the CH18.
The CH18 heat shields aren't easy to find, in my experience. One happened to pop up on eBay right when I needed one, but I didn't see many listed in the past that were either sold or ended. You might find something from a salvage yard.
As far as the PTO, I think it's the same and will fit. I'm sure this has been posted before in the forum somewhere. I have the bigger pulleyed PTO clutch on mine that was in the 2185 because I put a cyclops front axle under it so I can use my GT decks on it, which take the bigger pulley.
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1872 with 50C deck
1862 with 50C deck
1641 with 48GT deck
364 snow blower
IH Cub Original with deck
GREEN 317 with integral sleeve hitch, front hydraulic
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