User blog comment:B214/Volume 22 spoilers/@comment-73.46.6.122-20160720205153/@comment-1359322-20160721041454

You can't mix and match Evil Pieces and no the Evil Pieces don't go voided, it's link to the soul like how the Sacred Gears are.

"“First of all, the body can’t be saved. From the density of this curse, the body will perish first. Then their soul. There’s nothing more fragile than a soul which lost its vessel. Though the soul will also get devoured by the curse and perish quickly. Now the problem starts from here. ---Why didn’t the evil-pieces which are connected with the soul receive the curse? What happened to the Sekiryuutei reached the ears of this Geezer as well. The pieces returned to the master right?”"

This is also why Azazel assume Ise died when his Pawn Pieces appear, if it's linked to the soul like a SG, then removing it = death.