Numbers is a native application on iPad and will open Excel files seamlessly (there may be font differences), you can manipulate the files in Numbers, you can edit them and you can save them as either Numbers or export to Excel if you want to transfer them back to a Windows machine,
in addition, from the Windows machine you could either print the cut list as a .pdf and send that to yourself, or you could screenshot and send that. I would think of those two choices the .pdf would be most reliable.