I've listed the changes to the loot tables for zombie variants below.

Zombie
Loot Table 1
Resource || Entry Weight || Min Count || Max Count
Iron Ingot || 95 || 0 || 2

Loot Table 2
Resource || Entry Weight || Min Count || Max Count
Rotten Flesh || 50 || 0 || 2
Carrot || 10 || 0 || 1
Potato || 10 || 0 || 1
Pumpkin Seeds || 10 || 0 || 1

Zombie Villager
Loot Table 1
Resource || Entry Weight || Min Count || Max Count
Emerald || 95 || 0 || 3

Loot Table 2
Resource || Entry Weight || Min Count || Max Count
Rotten Flesh || 50 || 0 || 2
Carrot || 10 || 0 || 1
Potato || 10 || 0 || 1
Beetroot Seeds || 10 || 0 || 2

Husk
Loot Table 1
Resource || Entry Weight || Min Count || Max Count
Iron Ingot || 95 || 0 || 2

Loot Table 2
Resource || Entry Weight || Min Count || Max Count
Rotten Flesh || 50 || 0 || 2
Carrot || 10 || 0 || 1
Potato || 10 || 0 || 1
Melon Seeds || 10 || 0 || 2

Drowned
Loot Table 1
Resource || Entry Weight || Min Count || Max Count
Gold Ingot || 95 || 0 || 1

Loot Table 2
Resource || Entry Weight || Min Count || Max Count
Rotten Flesh || 50 || 0 || 2
Kelp || 10 || 0 || 5
Carrot || 10 || 0 || 1
Potato || 10 || 0 || 1

Increased Zombie Iron Drops