Mangler, yes, I did this on my 2018 CK3510SE HST as one of the first mods. Also installed one on a buddy's identical tractor. The step as a separate add-on part is identical to the left-side step, but is Kioti gray. If you found it for only $60, that's a bargain. Mine was about $93!
It bolts right up to the pre-existing holes, with four hex-head metric cap screws that you can source locally.
But, there is a factory-installed bracket that must be bent slightly to avoid interference. See attached pic. The bracket is probably there for future installation of a proprietary Kioti 3rd Function kit that was just becoming available at the time, so Wassup8687's caution is well taken! In my case it was a non-issue because I have a dealer-installed W.R. Long 3rd function, which does not use the bracket. In fact, the bracket was used only as an attachment point for the hydraulic lines with cable ties.
I reported on this in a TBN thread in June 2019, in more detail. Here's the link:
Anyone put a step on the right side of a ck3510?
Let us know how you make out.