Not sure if they're interchangeable, but most likely so. Main change from Blade 1 to 2 was Swiss Movement to Swiss Made (% of work done in Switzerland?). My first Oakley watch was a brushed Blade w/Carbon fibre face, but sold it some years back. Now I got two Blade IIs, both stealth, one steel band, one unOb band.
As far as the dude at Oakley told me they should be interchangeable.
They apparently have a whole bunch of used bands from various discontinued watches that they are cannibalizing for parts. I ordered links for $3/each. Pretty good deal.