This is right up there; with significantly higher difficulty. For one, Taiwan has radar.

D-day in Normandy was a much shorter and more protected crossing than the Taiwan strait. Additionally, the Taiwanese are much better fortified than the Axis were, and they have radar along with anti-ship missiles.

So far, though the attempted Mongol invasions of Japan, while premodern, were on a similar level of difficulty.

The sea between Taiwan and mainland China is really a formidable obstacle to such operations, even without radar, advanced missiles and drones. Ships are expensive, slow and vulnerable; even the Russians had to yield in the Black Sea after suffering serious losses against a nation with no navy.