Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 93056pr0001 Minifig Neckwear Armour Breastplate with Shoulder Spikes White and Ninjago Cracked Red Skull Print Print of this part
• 93056pr0002 Minifig Neckwear Armour Breastplate with Shoulder Spikes Red and Ninjago Cracked Red Skull Print Print of this part
• 93056pr0003 Minifig Neckwear Armour Breastplate with Shoulder Spikes Blue and Ninjago Cracked Red Skull Print Print of this part
• 93056pr0004 Minifig Neckwear Armour Breastplate with Shoulder Spikes Gray and Ninjago Cracked Red Skull Print Print of this part