Hey @majikstan77!
If you are completely replacing the landscape from the level, would it not work if you copied the assets from the other level into the one with your desired landscape? Or, if you want to preserve that level, duplicating the level itself and doing the same?
That way all the information about your landscape including any foliage is retained and instead you are just arranging the smaller assets.
If your meshes/actors in your other levels are in the locations you want, you can actually just select them all and paste them into your new level. They will stay in their relative locations.
I hope the above is the solution you need!