You don't need 3DXchange Pipeline, only the CC Pipeline Extension. Don't worry, there is only one version of iClone.
3DXchange Pipeline is an older product and used to be the only way to export. It is still needed for exporting non-CC characters but hardly anyone would need that.
3DXchange is still needed for importing props or certain custom characters, although this can now be directly done form within iClone (as long as you have 3DX).