Zombie template - does Natural armor improve or replace existing natural armor?

[Peet]

I am planning on adding a Stone Giant Zombie to an encounter.

A Stone Giant's natural armor bonus is +11.
The basic zombie template grants +3 natural armor to a zombie.

So does a stone giant zombie have natural armor of:
A (replace): +3
B (replace if better): +11
C (improve): +14

It seems at the CR the party is at, option A produces a zombie that will go down way too fast (AC 13). But then, a zombie stone giant has a lower CR than a regular stone giant.

Help is appreciated.

Peet

[Skylancer4]

From the stats on the zombie hill giant. Replace.

If a template would add, it would state that it increases.

[Baval]

replace sadly. same for skeletons. Turtles are useless undead.

[Peet]

Yeah, it seems a bit weird.

But thanks for clearing it up, guys.