Hi Jose,
connecting two HP41 by HP-IL is possible with two IL-RS232 interface or two HP82166A IL-Converter units. Exchange of data and programms would be possible.
Today a much better solution would be working with the full version of EMU41 which also includes HP-IL support. Also interfacing a real HP41 to EMU41 is possible - including exchange of data, programms and any type of files (ASCII, matrix, NNN´s...).
Upload data from HP-41 to EMU41 - than change the handheld and download data to the second HP-41. For this you only need the IL-Module and HP-IL/PC Interface Card - that is all. Furthermore this solution gives you much advanced features like emulator, barcode plott, exchange to PC world and web, mass storage, printer....
More about this you read in HP-museum article forum item 311 "HP41/PC gateway & emulator".
Best wishes from Germany - Christoph Klug