Replacing static meshes

I am trying to set up my level assets (floors walls etc) using a level map blueprint on a plane underneath… I imported the floor meshes but they do not fit the map … is there a way to replace a mesh (floor tile) with another mesh and have it keep the same scale/location/pivot etc so i can replace things easily ? When i tried doing this it changed the size and put it in a different spot with a new pivot point

Select all the meshes u want to replace and set the new mesh in Details Panel