Reference for Pesachim 207:3
מ"ד מעין פתיחתן סמוך לחתימתן לא בעי למימר בין קדושת שבת לקדושת יום טוב הבדלת ומאן דאמר מעין חתימתן סמוך לחתימתן בעי למימר בין קדושת שבת לקדושת יום טוב הבדלת
Wherein do they differ?<span class="x" onmousemove="('comment',' Seeing that in most blessings the' opening and the conclusion are similar in subject. Habdalah itself commences with 'He who maketh a distinction between holy and non.holy', while the passage preceding the conclusion is likewise 'who makest a division between the seventh day');"><sup>3</sup></span> - They differ in respect of a Festival which falls after the Sabbath [i.e., Sunday], when we conclude with '[Who makest a distinction] between holy and holy.'<span class="x" onmousemove="('comment',' Since both are holy, save that the holiness of the Sabbath is greater.');"><sup>4</sup></span>