If the part you need to replace was bought from Advance A.P. they will replace it with an equal or better part. I have run into a similar situation in the past. TRW and MOOG are (were) by the same corporation that probably made the OEM parts for Ford.
See if you can get the manager to get the 2WD and the 4WD parts into the store to compare. They are probably the same part but the 4WD parts may be a little more sturdily built. If all else is the same I would opt for the 4WD parts.