"Will it fit" is a little subjective. Anything will fit if you have the right tools Like @adsm08 said, Got a welder? and maybe a grinder and some cut-off wheels? Had you not said it was from a Honda Pilot, and just said I found a Grill Guard Will it fit my truck, the answer would be the same.
Eh, body shops and insurance adjusters don't call these "damage multipliers" for nothing. People think these will offer protection in minor parking lot speed accidents but they do the opposite. Skip it.