Nusach Ashkanaz places "l'dovid" always as the last teffilah. However, nusach sefard places it after aleinu during the week, but on shabbas it's placed after the yom: why is this?
נֻסח 'ספרד' says "אין כאלקינו" every day. On weekdays, it includes several paragraphs describing the makeup of the קטרת, followed by several פסוקים. On שבת, the description of the קטרת is cut ...
Sidurim (such as Rav Yaakov Emden's, but also modern nusach S'farad ones like ArtScroll's and T'filas Kol Pe) include a short prayer after various of the paragraphs of "Ezehu m'koman" asking God to ...