Regarding fire risk, keep in mind if you or someone in the future installs the wrong light bulb in the fixture than what it is intended/labeled for (i.e. non LED instead of LED, or higher wattage than the fixture is rated for - even LED). Construction and labeling between these two fixtures are not the same, I suspect. Side note: even though LED is lower wattage it might get hot from a fixture testing standpoint so be sure to go with rated wattage per fixture manufacturer regardless.

I can’t comment on the compatibility of the light bulb nor the suitability of what you’re asking, but I can point out that the backplate of the U.S. version is a little over 4 inches wide and is made to mount onto a typical U.S. 4 inch electrical junction box which is embedded in the wall. The fixture’s backplate of the European version is substantially narrower so it wouldn’t fully cover a standard electrical box (and would mounting hardware line up?). The U.S. version is UL Listed to conform to U. S. safety standards and the European one is not. Notice that the U.S. version is for use with a T3 light bulb (which is 3/8” diameter) up to 200W (doesn’t sound like LED)…whereas the European one says it’s for the LED bulb (which is likely larger diameter - note the dimensions on your light bulb spec sheets. The maximum wattage ratings on the European one might be rated much lower than the U.S. version but not indicated on the European cut sheet. There are some potential issues with risk of fire, electrocution, and electrical code compliance that you [can] get further insight on. I’d recommend you contact Luce Plan tech support or a distributor to ask about your intentions to see if it’s suitable and what they recommend so you can make your decision. Also, I recommend you check with an electrician as well. I’m saying these because it’s along the lines of what my thought process would be if I were to have been asked a question like this when I owned a couple of lighting fixture manufactur[ing companies] a number of years back.

EDIT: two spots which I changed text slightly for clarity and enclosed new text in brackets.