CloD uses completely new engine with a new modular architecture and without many of original IL-2 limitations. According to Oleg's posts at sukhoi.ru development of the new engine instead of limiting themselves to the old one was the main reason for delays in game development and his personal mistake.
At the same time CloD uses big parts of old IL-2 code because some members of the dev team failed to create new optimized code in time(and were fired). These parts were and I think still are being rewritten by new team members.
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