Hi,
I've found something from Wikipedia
On 1 Apr 1942, while resting and refitting near Orel, the Infantry Regiment Gro?deutschland reorganized and expanded to become Infanterie-Division Gro?deutschland (mot.). The existing Regiment became Infanterie-Regiment Gro?deutschland 1, and was joined by the newly formed Infanterie-Regiment Gro?deutschland 2. Supporting units in the form of a Panzer battalion, an assault gun battalion and increased flak, artillery and engineers were added with the upgrade to divisional status.
So the interpretation of Graham is very likely.
Regards
Massimo