That isn't the only difference. The hex values after that are all completely different as well.
I wasn't aware of this. However, I've never had this problem with any other DLC that I've downloaded form the US marketplace (for example, regular DLC that I've downloaded from the US XBLM has always worked.
So, the problem is is that MS and HMX haven't uploaded these songs to the XBLM for territories outside of the US.