Are these two fuse boxes interchangable? part numbers

[1maleyaj]

The underdash fuse box in my truck, an Early 99 F250, went out, and I was looking to replace it. I found someoneone with a fuse box out of a 99 F250 or 350, I can't remember for sure, and it is the exact same part number, except for the last letter.

They are:
F81B-14A067-AE <--------Mine
F81B-14A067-AF <--------His

I was just wondering if anyone knew if these were interchangable or not. I wanted to figure out before I bought it from him and ended up with something I cannot use.

Thanks for any help

Anthony

[1maleyaj]

Sorry guys, just realized I posted in the wrong section. Just saw the 7.3 in the title.