Fragments keep the same identification and endpoints while lengths and offsets differ.
Fragments share an identification
Both fragment headers carry identification 0x1c46.
identification=0x1c46
Addresses also stay together
Both headers keep the same source and destination fields. The bit strips decode those exact address bytes.
protocol=6
Each fragment has its own total length
The first fragment total length is 36; the second fragment total length is 28.
Summary
The identification and endpoints tie these two smaller headers back to the same toy packet.
id=0x1c46