GetAllActorsOfClass(your2ndblueprint) → array get node index 0 (assuming its the only one, otherwise youl have to choose a number that corroponds to the proper one) and then right click on the blue node and promote to variable. You now have a reference variable directly to that object.
You dont have to promote to a variable you can just drag off the blue return pin of array.get[0] but it allows you to reuse the reference. You can do this in any blueprint. It is a [tiny] bit hard on performance but since your only doing it for one object reference its negligable.
Hope this helps
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