That temperature difference won't make much difference, but if one of the items is something like bread or cake that's active in the oven, I'd use the recommended temp. for that; meats, vegetables etc. are more flexible.
Depending on what you are cooking, it probably shouldn't make a great deal of difference; set the oven at 375 for both if you wish to cook them together. If you let us know what exactly you're cooking (or better yet, link to the recipes) we can give a more accurate answer).
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