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It's technically possible as both games have the same engine. Feasability is I think a greater concern as it would take ages to convert the game to work with the map. Seriously, I think your looking at a few months, if it's a one-man job. There's a lot you need to change.

If you just don't like the look of the HOI2, then check out this map mod:

http://forum.paradoxplaza.com/forum/showthread.php?t=463587

Maybe you'll like it better. It's not released yet but you can find an earlier map mod he did in the thread.