Nope I don't have a US Version. Btw it should still work. If your PSN account is a US account, when you go to PS Store and when you download a free DLC, it will download you the US version one.
So in your hdd, there will be created a BCUSXXXXX folder, which is for LBP. The only thing that changes is that you have to paste the files from BCES00141 and BCES00850 to BCUSXXXXXDLC0 instead of BCES00141DLC0 and BCES00850DLC0. It should work with this way aswell