MR4-BX vs MR4-BX worlds

[chokoboy]

I have been offered a yok mr4-bxf for almost nothing.
What is the main difference in MR4-BX and the worlds version? And is MR4-BXF the standard or the worlds?

Here's a couple of pics of the car im offered please tell me if this is the standard or the worlds kit!

Thanks for the help!
Dennis