Armored Spider:

has 12 hp more and 0.1 knockback resistance.

Skeleton Warrior:

has 2 hp more, 0.2 knockback resistance. Additionally, he shots apply one of the following status effects: weakness, slowness, instant damage.

Forgotten:

has 12 hp more, walks a bit faster and applies mining fatigue to enemy

Cave Creeper:

It exploits slightly stronger than a normal creeper

Tropical Spider:

deals less damage, but poisons enemies

Brown Recluse Spider:

when it attacks it inflicts poison

Bone Spider:

when it attacks it inflicts slowness and can shoot small bones from a distance

Zombie Explorer:

has 4 hp more and applies poison to enemy

Frozen Zombie:

has 4 hp more and applies slowness to enemy

Skeleton Corsair:

wields wooden sword.

Toxic Slime:

 poisons enemies. Smallest Toxic Slimes can still attack.

Sand Slime:

applies slowness to enemy

Ice Slime:

applies slowness to enemy

Nightmare:

 has 6 hp more and shoot 2 fireballs

Executioner:

has 26 hp more, 0.6 knockback resistance, and spawns with axe and iron helmet

Soul Stealer:

Deals additional magic damage, uses melee attacks

Zombified Piglin Brute:

walks faster, has 22 more hp, deals 1 more damage and wields golden axe.

Additionally, it gets angry when player gets too close.