Ballpark, sure. They’re both citrusy American-type hops. That said, I don’t think Centennial is a great sub for Chinook - especially given how precious Centennial will be for the next couple of years. I’d say Columbus, but it’s a little too “dank”. Maybe 50/50 Columbus/Cascade?
Centennial won’t have that piney taste that Chinook has. I don’t think it’d be a good sub, but you’d still turn out a fine beer, I’m sure. If you want ballpark, you’ll probably be fine using Centennial. The malt character of Arrogant Bastard will still be there.
You’ll still make a fine beer, but the hop character will be rather different. If you use Chinook, Columbus or maybe Nugget for the bittering charge you will be a lot closer. To me, the snappy bitterness is a big part of AB’s character.
chinook is a little easier to get right now - I’d buy some chinook, brew the AB clone, AND make another IPA with the centennials - maybe something in the 2 Hearted Ale vein?