Maybe but Gaara's sand and Raikiri doesn't have the same function. Gaara use his sand to overwhelm people and crush them with it, but Raikiri/Chidori goes through by penetrating even the hardest rock. For example the chidori from Sasuke has gone through Gaara defense easily.
Apparently Kimimaro died against the Futon rasen shuriken from Naruto in this war. A jutsu that didn't even hurt the 3rd Raikage with his lightning armor, but a chidori from Sasuke hurts a little bit the 4th Raikages through his lightning armor.
So i believe chidori/raikiri is better and the best jutsu that can cut through almost everything.
The only reason Naruto's Rasenshuriken didn't hurt the 3rd Raikage was because he was an Edo.
Also, the 4th Raikage didn't get hurt even the slightest by Sasuke's Chidori. Sasuke didn't even damage him. He just barely touched A's skin.
Naruto's Rasenshuriken took down the 3rd Raikage's body. He only recovered because he was an Edo:
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This body is clearly sizzling and smoking. It means he took the damage
Lastly, Kimimaro was only seen facing against one of Naruto's KM clones with a Rasenshuriken in-hand. This does not mean Kimimaro is dead. Things happen in the war at different times. If Kishi wants, he would easily change the outcome of that scene by having someone, Jugo for example, intervene and give Kimimaro a proper match. Though whether this will actually happen is doubtful