Hi Osvald,
You're absolutely right. The adoption of the old regimental numbers in the garrison locations for the Banne was intended to emphasise the lines of tradition of the new (Nazi) state to the "good old" times in distinction to the hated Weimar Republic, and thus also to achieve a suitable acceptance among the population.
Quote: "Die (Jung)Banne sind im Reich durchnumeriert, wobei meistens die Traditionsnummer des örtlichen Regiments gewählt worden ist." [Vorschrift über den Jungvolkdienst, 1.2.1938, p. 52] (The (Jung)Banne are numbered consecutively in the Reich, whereby mostly the tradition number of the local regiment has been chosen. Regulation on the Jungvolkdienst, 1.2.1938, p. 52).
About the so-called Hunderter: The Leib Regiment was founded as early as 1670. In the 18th century it had very different locations until it was finally stationed in Dresden in 1815. Since 1867 it was called 1st (Leib) Grenadier Regiment No. 100, two battalions of which became the Royal Saxon 2nd Grenadier Regiment No. 101. The barracks were in Heerstraße (today Stauffenbergallee) in Dresden-Albertstadt, the 101 directly next to it. The commander of the regiment was the Elector of Saxony or King (after 1806), of 101 the Prussian King (and then Emperor).