LEGO 18828 vs 98385 Spiky Hair
18828 and 98385 Spiky Hair pieces are very similar. 18228 is shown on the left and 98385 on the right below.
Notable differences, topside
The tuft of hair at A is wider on 18228. The tuft at B protrudes more dramatically on 98385. 18228 appears to have a crisper sculpt where 98385 is overall more rounded along edges. 98385 has a shinier/smoother finish.
Notable differences, underside
18228 has a narrow underside ring to hold the stud. the mold number is located outside the ring.
98385 has a wide ring to hold the stud. The mold number is located inside the ring.