It is impossible to learn much about velocity when comparing different guns. I've compared a lot of guns velocities over the years and even with the SAME barrel length 25-50 fps difference is the norm. And I've seen as much as 130 fps difference. I've seen some 22" barrels shoot faster than some 24" barrels. And I've seen some 24" barrels be significantly faster than some 22" barrels. Many barrels, for a variety of reasons just shoot slower than they should.
The only number that means anything if you want to know for sure is to buy the 26" barrel, measure velocity at 26" and again as you cut it shorter. Of course you probably don't want to do that.
A 30-06 class cartridge's sweet spot is around 22"-24". You still continue to pick up speed with longer barrels, but in smaller increments beyond about 24". Going shorter than 22" and you start seeing speed drop off in larger and larger increments as you go shorter.
I think the biggest difference between having a 22" vs 26" barrel on the #1 is primarily aesthetics and balance. For me, 22" on a bolt gun is what looks and balances best. It moves easier through brush and the 30-50 fps I'd gain from a 24" barrel just isn't worth it to me. Going to 26" on a bolt gun would be completely unacceptable for me.
But on the #1, the way the receiver is made a 26" barrel would give about the same overall length and balance as a bolt gun with a 22" barrel. All things being equal you would probably be 50-75 fps faster too, but there is no way to say for sure. A 22" barrel on the #1 would result in a very short rifle that would balance and look much differently.
To my eyes, a 26" barrel on the #1 looks and feels better. But that is personal preference.