E.g. 2x black matriachs, 2x bladetwsiters, 2x combustion bands, etc. etc. etc.
Thanks in advance!
I don’t believe so no. I don’t believe a Mythical and non-Mythical will stack either. Someone else will have to correct me on that though.
But 2 identical items can double proc their…well, item procs?
Yes, they should proc independently
To the topic: It depends of the type of RR.
-x% RR stack, others dont (with the exception of Dreeg-component, which only stacks with itself)
Thanks for your input guys!
Perhaps my question lacks clarity - I get that -X% RR stacks only if the sources are different. I suppose my question is this - does the game engine consider the -X% RR from 2 identical, but separate items as the same source?
Evilbaka here, and korsar both believe the answer to be yes. And given their game knowledge, I’m wondering if my assumption is just that - an assumption.
I don’t even know what’s real anymore. 
-x% does indeed stack but only from different sources.
A pair of Black Matriarch procs for example will not stack as they are from the same source. I have also heard that things like a Mythical Black Matriarch and Black Matriarch will also not stack.
Nope, they might proc it sooner or more consistently but no stack afaik
Anyone tested this on Dummies?
That seems illogical to me. It’s like saying the conversion from 2 identical chillflame evokers will not stack because they come from the same source.
Hmm. But it is what it is.
Much appreciated guys.
Yes. They do not stack.
Separate items with the same proc can each proc independently, but they will only refresh each others’ duration. This also goes for procs of different levels; for instance, using a non-mythical and a mythical Ring of the Black Matriach will not stack the related proc.
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-Conversion is not a debuff whereas ring proc resist reduction is.
-Overlapping a pair of ring procs is basically no different to double-casting a debuff like Curse of Frailty - it just refreshes itself.
-I suppose it gives a bit more variety to ring usage as well nowadays than slapping on a pair of Eternal Haunts onto a Cold/Aether build, Combustion Bands onto a Fire build etc… That’s just my thought though.
Tested - two identical items procs don’t stack. Didn’t tested myf+non myf but I guess it still don’t work as the game think its the same spell.
I suppose that does make sense.
2 players hitting the same target with CoF will not cause said target to have more RR.
They are not the same mechanic. And if they did stack, everyone would just stack them.
But you can matriarch+bladetwister etc