You can use PasteSpecial with xlPasteFormats
.
Excel.Range R1 = (Excel.Range)oSheet.Cells[11, 11];
R1.Copy(Type.Missing);
Excel.Range R2 = (Excel.Range)oSheet.Cells[15, 15];
R2.PasteSpecial(Excel.XlPasteType.xlPasteFormats,
Excel.XlPasteSpecialOperation.xlPasteSpecialOperationNone, false, false);
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