ok,thank you ZacD.
So I can take them to Blender- half the amount of polygons (if effect still is good for me) or even use them as a starter,mold for creating my own asset (nothing coplicated-probably removing some elements, copy-pasting here and there).Then import them back to mu UE project and there use it to make final product.
That’s seems fantastic to have such assets at hand to use,start with
Rest of your reply-heard sth about Nanites, ofc about LODs but have to remind and learn more about them first. BUT thank you for showing further steps,solutions.