Depends which FX4. What we think of as the "real" FX4 rims are the 15x7 Alcoas. The rims on eBay there are the 16x7's.
Quickie FX4 primer:
The Ranger FX4 came out in 2002. Got you Bilstien shocks, an additional front skidplate, Alcoa rims with 31x10.50 BFG A/T's, and a Torsen rear diff, plus some other minor goodies.
From 1998 thru 2002 there was also a Ranger "Off-Road Package". I used to have one, an '02.
The equipment varied by year, basically you got heavier shocks, 16" rims, fuel tank and t-case skidplates, foglights, and decals. Not as good as an FX4, but not bad.
In 2003 and up, Ford changed the labeling a bit, so....
A 2002 FX4 = 2003+ FX4 Level II
A 98-02 Off-Road = 2003+ FX4