Revisiting this... I work slowly.
All "blue" silicone hoses from 95-02 that I've seen in the yard are blue inside and out. The hoses from 2003 to 2011 are blue on the outside with a brown layer on the inside.
They all have Ford part numbers on them too for what it's worth. I think they just designed them differently in 2003. Not sure what the brown inner core does that the blue outer core does not?
EDIT: I just looked it up because I wasn't sure why they were doing that. I found a bunch of performance sites that were selling aftermarket cooling hoses, and apparently the brown inner-core is a type of silicone that has a higher tinsel strength. All the quality performance silicone hoses have that brown inner core for added strength. I guess Ford decided to up the quality in 2003 over the previous years.
I never installed the silicone hoses, because no matter what I tried, the inside never came clean. I scrubbed, soaked, used everything I could think of and could not remove the caked-on rust.
A couple of months ago, I came across an '05 in the yard with silicone hoses. Someone had already removed the hood, fenders, wiper tray, radiator, and header panel. I looked inside a hose and saw that it was perfectly clean, so I grabbed them all in what must have been the fastest radiator hose removal in history.
With that said, I think there must be something else special with the orange inside of the 03+ hoses, because these things just rinse out. I looked at an '07 and '09 at the yard today, and they all had perfectly clean hoses as well. There's usually a bit of "residue", but nothing like the all blue hoses on the -02.
Just FYI... I haven't even touched the one on the left. The hoses from the 99 never did come clean.
Also (if anyone is still reading this), I'm not sure why it took me so long to think of this, but is there any reason I can't use an oil cooler instead of buying a straight piece of silicone hose and an adapter, or getting someone to roll the ends of a pipe? Not hooking up the oil lines, of course. An oil cooler is $15 at LKQ, and seems like it would be less trouble since it's a direct fit.