Stacking Bodyguard and saving shield

[H2Osw]

Do the effects of these stack?

Bodyguard wrote:

Your swift strikes ward off enemies attacking nearby allies.

Prerequisite: Combat Reflexes.

Benefit: When an adjacent ally is attacked, you may use an attack of opportunity to attempt the aid another action to improve your ally's AC. You may not use the aid another action to improve your ally's attack roll with this attack.

Normal: Aid another is a standard action

Saving Shield wrote:

You deflect attacks that could mean your ally's death.

Prerequisite: Shield Proficiency.

Benefits: Whenever an adjacent ally is the target of an attack, you can, as an immediate action, grant that adjacent ally a +2 shield bonus to AC. You must be wielding a light shield, heavy shield, or tower shield to use this feat.

[Michael Sayre]

If you have both an attack of opportunity and an immediate action available, I don't see any reason they wouldn't stack.

[SlimGauge]

Two things to note: The AC bonus from aid another is untyped (stacks with other types) but is only good for the next attack from that opponent. The Saving Shield bonus is called out as a shield bonus that would not stack with other shield bonuses that ally may already have.