Gaara can solo, this isn't even fair.
C4 is countered by Sand Sensing. Sand particles > nanosized bombs; once the sand makes contact, Gaara will know what's up.
Nothing else in Deidara's arsenal is troublesome, and Gaara proceeds to violate like he did in canon, but this time without the ****ery Deidara pulled as he had to protect his village.
Sasori simply gets shat on. His Iron Sand manipulation is nowhere near as versatile, or flawless as Gaara's own. As well, the shit is slow, the only notable construct are the needles, which are garbage in damaging aspects seeing as a mere chakra shield blocked them.
Gaara's Sand speed >> Iron Sand speed in mass constructions.
Literally the artist duo get shat on, I'll be generous and say high diff. It's actually low-mid though.
Edit: Just seen the location lmfao... It's a neg diff. You put Gaara in a desert. R.I.P.
Fuck Rasa.