What is the likely ultimate consequence if isotopic signatures in the deep blobs match the building blocks of the Moon?

It would offer a powerful confirmation that these are indeed Theia's preserved corpse material

The scientific utility of examining the chemical fingerprint of these deep mantle anomalies centers on linking them directly to the Moon-forming event. The Giant Impact Hypothesis describes the Moon forming from a mixture of Earth and Theia material ejected into orbit. If geochemists can verify that the elemental ratios and isotopic signatures (like those of tungsten) within the deep blobs precisely match the predicted composition of Theia—the material that created the debris disk—it provides observational evidence from within our own planet supporting the primary theory of lunar genesis. This confirmation would effectively rule out alternative explanations, such as the anomalies simply being undifferentiated primitive material that sank early in Earth's history, lending significant weight to the conclusion that these are preserved fragments of the impactor.