2 Items, Same Passive, which one get's taken?

So, let's say I for whatever reason build both Luden's Echo {{item:3285}} and Runic Echoes {{item:1402}} on a champion. Both of them have a unique passive called **ECHO**, however, they deal different amounts of damage. * {{item:3285}} = 100 + 10% AP * {{item:1402}} = 60 + 10% AP Now, I know that you can only have a unique passive **once**, so in this case, which **ECHO** would you get? The one from Luden's, or the one from Runic? And how does it decide which one you get? By which one deals more damage? The one you bought first?
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