There is an apparent machloket between the Kitzur SA and the Mishnah B'rurah re: the Nusach of the Baruch Hammavdil phrase (outside of Shemona Esreh) which permits M'lachah before Havdalah.
1. The Mishnah B'rurah 299:34 has simply "Baruch Hammavdil bein Kodesh L'chol"
2. The Kitzur SA 96:5 continues with the rest of the paragraph recited during Havdallah on a kos, "Baruch .... Bein Ohr l'choshech... Baruch Hamvdil..."
Do you know of anyone who uses the longer version of the KSA in pratice?