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This font consistency question came up in a prior forum thread earlier this year, but for 3.1.07.42:
Excel Export File Questions
I'm no Excel expert, but you can read the results of my xls and xlsx exports there, where I note the same issue you mention even in 3.1. SQL Developer uses the java.awt.Font defaults of (DIALOG, PLAIN, 12) when it calls the API that writes out the Excel files. As far as I am aware, no request has been made, or work done, on adding a set of preferences for Excel export Font/Style/Size.
Here is one such request from the SQL Developer Exchange for "Various Components", but no explicit mention of Excel:
SQL Developer Team