As far as I know the Grenadiers Royaux were made up of grenadier companies from Militia units. See more at Kronoskaf A decree, dated September 15 1744, created a grenadier company within each French militia battalion. On April 10 1745, another decree ordered to detach all militia grenadier companies from their parent battalion and to group them in 11 regiments of Grenadiers Royaux. Each regiment consisted of a single battalion named as per its colonel.
Sabre des Grenadiers Royaux
Sabre - see more here
There's an interesting blog piece here on French grenadiers