These variants have a highly unusual shape with no lugs1. The hole of the left one through the head was possibly used to attach the amulet on the mummy bandages

Red jasper with carnelian head and
chlorite wig H 5.4, W 2.7, T 1.5
New Kingdom-Third Intermediate Period
Dynasty 18 or 21-22 MET #38.8

Green glaze inscribed
H 5.0, W 2.1, D 3.5
Late Period, Saite Dynasty 26
Museo Egizio #Provv. 1218

References

1None, Unexposed amulets