Theres someone on EBay selling rear calipers for Sierra/Escort and Mondeo. Are they interchangeable?

I didn't think this combo were interchangeable.
If I remember correctly the Sierra rears are the same as the Granny rears.

maybe he asks to specify?

I've just checked and he says these will fit most Fords? Bit unsure to this as I thought it was just Sierra and Granada that were interchangeable. Be annoying if you bought these in good faith and they didn't fit.False advertising!