I guess they should work together, the are the same type of bike basically from what I can tell. The BB shells are probably the same 68 mm.
What is going on with the Moby seattube? It looks like an elliptical tube but with a round seatpost?
1985 Pinarello Trevisio, 1991 Colnago Master, '06 Bianchi San Jose, 1987 Moulton Fuso, '80's Gardin Shred?, '82 John Howard(Dave Tesch)
The bottom bracket and crank will transfer over just fine. You'll need a bottom bracket tool and a crank puller for ISO square taper. Also a lockring tool, some good lithium or molybdenum grease like Phil Woods (or go to Autozone). Allen wrenches to swap over the seatpost, saddle, stem, handlebars. Metric, probably a 6mm, 8mm, 10mm. You probably already have a 15mm wrench for removing the wheels. And you'll need a chain breaker. Get a good one, the cheap ones are a pain to use.
You really think it's a downgrade? I got a deal on the Bowery, so I bought it even though it's a bit small for me. Now I want a larger frame. The slanted TT on the Bowery also erks me. I want a track style frame and the BD seemed as good as any, but if you can recommend a better one that doesn't cost an arm and a leg I'd definitely consider it.