Corbulo + Sanguinary Priest(s)

[Knaru]

So, I came across this reading over the codex, and wanted to ask the community to make sure I'm not losing my mind.

Corbulo has an ability called "The Red Grail".  Of note in this ability is "Friendly BLOOD ANGELS INFANTRY and BIKER units increase their Strength characteristic by 1 whilst within 6" of any SANGUINARY PRIESTS"

Sanguinary Priests have an ability called Blood Chalice, which does the same thing but is a different ability.

Given that they are abilities with different names, do these stack? Does any BA Infantry of Biker unit within 6" of any of your Priests (including Corbulo, since he has the keyword) get +2 Strength?

Edit: I did search for this first, but didn't find anything relevant in the first two pages of results.  I will confess to only skimming there so if I missed anything, I accept all judgment and shame.

[Spagunk]

Nah, this was covered I believe in the index FAQ: https://whc-cdn.games-workshop.com/wp-content/uploads/2017/11/warhammer_40000_index_imperium_1_en-1.pdf
 

Q: Are the +1 Strength boosts from the Blood Chalice and Red
Grail abilities cumulative, for a total of +2 Strength?
A: No. It’s only +1 Strength, even if the unit is within
range of both these abilities.

 

And I am willing to bet if the index has this, it's still applicable even though we have the codex.

[Knaru]

Ugh.  GW should definitely port over any relevant rulings in the Index FAQ to the Codex one.  It's ridiculous to have to hunt things like this down in FAQs that really aren't relevant to this army anymore.