I am going to add that if there is a TLAM YJ-18, its going to lose the YJ moniker for a CJ or DF one.
The second is that the commonality between this land based cruise missile vs. the YJ-18 would only be in the second half of the missile, from the wings to the tail. Instead of having a second stage terminal rocket, the cruise jet portion extends further into an ovoid nose that contains warhead and guidance system. There is no terminal stage separation with supersonic sprint, the missile flies all the way to its target on subsonic speed.
The third is whether this missile already exists and serving with other branches, either in both air or land, but lacking a naval version. It should be under 9 meters in length with booster and well within the .85m diameter to fit the long U-VLS. Similar to the Russian 3M14, the warhead could be around 500kg. This cruise missile should be a recent one. When in flight, the wings would switch straight, no sweep back. The intake would be similar to the YJ-18, a fixed mouth opening on the bottom. The missile would have a CJ or DF moniker.
There is one missile that checks these boxes and that is the CJ-10, now DF-10. With booster, the missile's length is about 8.3 meters. The missile's diameter is around 0.68 meters. Weight is around 1800kg or 1900kg which is under the 2500kg expected of the YJ-18. With the range of 2000km, missiles fired from the east coast of China could reach well within the largest Japanese island of Hoshu. You can push that further when fired from the air using an H-6.
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The range is probably why the missile for now isn't on a ship, as it is able to deal with threats in the first island chain being fired from land alone. But if the mission is to expand further, it is a good candidate to fill the long U-VLS, with it having all the proper dimensions.
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Calling it a land striking variant of the YJ-18 might be more misleading, compared to the proper way to call it, which is a navalized, VLS variant of the DF-10.