The Ford parts book shows no distinction between the bumpers on a wagon or passenger car.
However there are different numbers for the gravel shield aka stone deflector between them. But I don't think that would matter if you are changing only the bumpers.
Also keep in mind that there are many different bumpers for the same vehicle. W/ no holes, W/guards,W/strips, W/guards & strips etc.
Please note that this for info only as I have never done it myself.