I think that after a SoD-compatible BG2EE patch those who play BG2EE with characters that are not imported from SoD will play it exatly the same as they play now, without any differencies.
Any differencies in the form of level-scaling monsters in BG2 will be seen only when you play BG2EE with a character imported from SoD and come to a BG2 location having more XP than before.
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Any differencies in the form of level-scaling monsters in BG2 will be seen only when you play BG2EE with a character imported from SoD and come to a BG2 location having more XP than before.