Although i am not entirely sure, i would think the IP exemptions are different. if you play on red or blue, you can are allowed to box a char on the opposite server. which tells me that both servers do not use the same database for IP exemptions. I cannot say for sure, but this is what i think the case is. best way to find out is to simply try it and see if it works.
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Miku (ミク) [Future] Hatsune (初音) [First Sound]
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