Is elemental lead as toxic as lead compounds?
Pb(IV), in all likelihood, will quickly get reduced to Pb(II) once it gets into a human body. So as far as poisonings go, these two can be considered equal.
Elemental lead will partially dissolve in stomach, but mostly go out undigested. So it is way less harmful than any compound of Pb(II). There were people in the old times who survived bullet wounds and used to carry bullets in their bodies for decades, with little or no apparent ill effects.
Then there is a wholly different story of the covalent compounds of Pb. They are more toxic than ionic Pb(II), and some are capable of penetrating through the skin. In particular, the notorious $\ce{Pb(C2H5)4}$ has caused our civilization a great deal of harm.
So it goes.