Going to 2nd (or 3rd) all the previous posts. Their info. is correct. PTO Hp should be exactly the same UNLESS the non-clutch SE possibly creates some additional driveline power loss. I am not well trained enough in this area.
I tried both the SE and standard and ending up buying the CK3510 HST (non SE). like others have mentioned, I did not want mirrors, cruise, linked pedal, or tilt wheel...I keep myself in good shape and the room on the operator platform w/o the tilt wheel is already ginormous. I also prefer Pat's EZ change over the extendable links.
To my CK3510 HST (Non SE), I added the OEM floor mat, dealer installed OEM 2 rear remotes, dealer installed OEM 3rd function, dealer filled rears. All of those add on's for a before tax total of $20,949. Yeah, I suspect most of us could go out and buy a couple of these,...and pay cash. but most of us like the idea of a good deal too.
It depends on what you prefer so evaluate what is important to you. If you need/want those items, a better seat, etc. the SE is for you.