I didn't have any issues with it, and the sims did have the exact same name (I often give them a slightly different name, though, since it helps to tell the, apart in the InSIM summoner menu). I would say that you'll be fine, though I'm not 100% sure, since I don't usually save after setting up those types of scenes (not so much because of the summoning, but the other InSIM things, like aging up or down).