Mechanics of chance orbs compared to mechanics of items dropping?

So, when it is rolled that a unique will drop, the unique is chosen not caring about base type

Therefore; on drop, two uniques having the same base type have no effect on each other in terms of the drop rates.

The question is, how does this property apply to chance orbs, considering that you chance the base item?

My assumption is that the chance orb acts like a drop, when it is determined that the chest will roll unique it does the same method it normally would on a drop.

So, the roll has no care about the base type, but is forced into a scenario where there are two uniques that it could possibly roll, in this scenario does the existence of two uniques on the base type have any effect on the outcome?

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So, when it is rolled that a unique will drop, the unique is chosen not caring about base type

Not entirely true. The base item needs to be able to drop, for one, so you can't get a Kaom's in a1n.

Separately, there is an itemlevel component to the unique drop as well. Even if your zone can drop a Spine Bow, it can't drop a unique Spine Bow unless the itemlevel is over 70something.

Lastly, there are unique rarities, and some base items don't have a single unique in the rarity tier you roll, so technically, knowing the base item roughly tells you what rarity tier you got.

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The question is, how does this property apply to chance orbs, considering that you chance the base item?

My assumption is that the chance orb acts like a drop, when it is determined that the chest will roll unique it does the same method it normally would on a drop.

So, the roll has no care about the base type, but is forced into a scenario where there are two uniques that it could possibly roll, in this scenario does the existence of two uniques on the base type have any effect on the outcome?

Chance orbs bypass the itemlevel component to uniques, full stop.

They also do not check your MF at all.

There is a fixed chance table which chance orbs draw from, unique for each base item (since some base items have 2+ possible uniques, and because different uniques have different rarities on the chance table).