Numbers 1:2 gives the same census command at Sinai — here repeated in Moab for the new generation entering Canaan.

Numbers 1:3 specifies the same age requirement (20+) and purpose — mustering for war — as this second census.

Numbers 32:11 explains that the first generation (20+) died in the wilderness — necessitating this second census of their children.

Numbers 1:19 records the completion of the first census at Sinai — here a new command for a second census.

Exodus 38:26 records the same age requirement (20+) and the total counted in the first census — parallel to this second count.

Exodus 30:14 also specifies census age 20+ for the ransom offering — here age is same but no ransom.