Sorry but I know nothing about what the off-set may be on wheels I know nothing about. All I could tell you is if the wheels are OEM Ford wheels they are interchangeable. I've seen '07/'08 wheels mounted on 2009/2010 F150. The 2010 FX4 20” wheels I put on my 2010 XLT Screw seem to have a little more off-set than the stock 18” wheels I took off.
all 17/18" rims from 2004-current F-150 have the exact same width and offset. all are same bolt pattern...7.5" wide btw
all 20" rims are 8.5" wide and the offset is slightly different from the 17/18" rims. They are wider than the smaller rims due to smaller sidewall. has exact same bolt pattern though.
other options for rims that will fit your truck
2003-current Navigator (be careful as some had a 1/16" smaller hub and they get stuck on axle)
2004-2008 Mark LT
Saleen F-150 has 23" rims...they fit. are staggered though, 9" wide front, 10" wide rear
Roush F-150 has 20" rims...they fit. believe they are 9" wide
Harley F-150 has 22" rims...they are darn pretty IMO...and they fit