After reimporting the other wallet.dat again, I think I was fooled by my own perception. Both share same transactions, thus the impression of a similar transaction history as well as many addresses with tiny balances etc..

I went through every view and added a bunch of notes, you'll find the part about the floating point delimter there, too: http://i.imgur.com/lffLvCB.png


Edit: found the delimiter problem: DataTables appearingly use their own localization information and overwrite even what was defined on a thread scope. Quickfix: currencylist.Locale = System.Globalization.CultureInfo.InvariantCulture in the module file.