It is probably fine, depending on which pretender you picked. If you want, open up the conceptbalance_complete_5_2.dm file in your Dominions2/mod folder, and look for that pretender (use Notepad or Wordpad or some other text editor to view it). Then open up the conceptbalance_complete_5.dm file and find your pretender in there, and compare the values. I believe there were only a few minor differences between the 2 versions with respect to pretenders, like only 3 or 4 pretenders had changes, the rest are identical.
So we might be okay and won't need a restart. Because the little I know about the mods, if your pretender has the same lines in the 2 files, we shouldn't need a restart. Of course, I could be wrong.
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