I've had the pleasure of doing 100s of eols onto rivers, lakes & the open sea in 47s & 206s. The main difference between those 2 types is the shape of the float. The 47 float is the shape of a big fat Cuban cigar with drag characteristics of a small parachute. The 206 is beautifully streamlined & a joy to fly.
With both machines the auto characteristics are not much different to skids, just a bit more sloppy which you should be able to sort out after 1 or 2 goe
s. The 47 needs to be quite slow on touchdown whereas the 206 can do quite a fast run on. Both need their floats to be well blown up as cold water makes them go quite soft if you spend much time water taxying. The 206 needs a bit more back stick than the 47 to allow it to run on. All the pilots I've checked, if they could do good eols on skids, had no problems converting to floats.
As for doing an eol on land, not so easy! A friend in PNG on a max weight take off with 2 big geos on board, at first light with zilch wind, had the throttle rod break off at full throttle. At 3000 feet he explained the principles of eols to his 2 pax & stopped the engine. He selected the long wet grass near the runway & almost made a zero speed touch down but sad to say, the main rotor nicked the tail rotor drive shaft. A bit lighter & he would have managed it, so stick to water!