Can I move Windows 7 to a larger partition with 'dd' instead of WinClone?
While you could technically use dd to image a smaller partition onto a larger partition and it still show using the space of the smaller partition you'll not be able to resize the NTFS partition using Disk Utility.  Also the GPT and PMBR will not be synced and that will need to be resolved. Windows 7 will also need to be reactivated.

That said, using Winclone (at least Standard version) would be a much better option as it will handle what's necessary that Disk Utility can't, except for reactivating Windows, which is totally a Microsoft issue in resolution.