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23mm is a pretty common/standard size. So, I don't know why they wouldn't fit. That would be really weird.
It's not an issue if they'll "fit". It's an issue if it's safe to do so.


The Fulcrum Racing 4 is a wide rim. Per their specs: TYRE WIDTH From 25 mm to 50 mm
Fulcrum®’s R&D department, following requests from the competition circuit, has worked to create rims that are wider than before, about 4 mm or more than previously. This technical choice provides an ideal basis for 25/28mm tyres, the sizes currently popular.

So using a 23mm tire will produce quite a low profile. You'll need a very high pressure to keep from pinch flatting or denting the rim on holes.
 
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