Replacing objects (or collections or instanced collections) by instanced collections

I know how to replace object data. But what do I do when I want to replace multiple Objects (or anything else for that matter) by an instanced collection or even a not instanced collection?

In my example I would like to replace each stair steps by the inctanced collection on the left. The steps are linked objects.

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Good question, have you found an answer to this?

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bump I’d also like to know. I know Blenderkit can do it, so it must be possible!