But is the inverse (converse?) true -- will my experience and fitness gained in the ADKs help when I go for the Catskill 35?
It
might.
Seriously though, while the Catskills High Peaks are smaller and for the most part much less remote mountains than the Adirondack High Peaks, I would say that they are actually
more challenging in at least one respect-orienteering on the trailless peaks. Just speaking from my own experience, I used map and compass a great deal during my first round of the 35 and a fair amount in subsequent rounds. During my round of the 46 I think I used my compass twice-once in the Santanoni Range, once in the Seward Range, both times just to briefly check something. I found the Adirondack herd paths very easy to follow for the most part, if somewhat (to say the least) difficult to travel upon at times.
This is simply to make the point for Indian Chris that if you've experience orienteering the truly trailless peaks of the Catskill 35, then finding your way to the summits of the Adirondack 46 shouldn't present a huge problem.
Making it to those summits on the other hand, can be a challenge. Many path sections are eroded, muddy, rugged, steep, slabby, scratchy, etc. Fun!
And then there's the longggg approaches to some of the peaks and ranges.
Matt
P.S. Oh, and Adirondack miles are longer. Trust me. On the paved roads, too...