As panzerkonig says, the 22 February 1811 directive made pompon and swordknot colours the same for all branches of infantry: grenadiers, musketeers, and jägers. Read it for yourself, in Mark Conrad's translation of A. V. Viskovatov's seminal work, A Historical Description of the Clothing and Arms of the Russian Army - Vol. 10b - Grenadiers, Musketeers, Jägers, Marines, and Carabiniers 1801-1825 (publ. 1851), found here: http://marksrussianmilitaryhistory.info/V10BAll.htm.
"Assumptions" are dangerous things to make when it comes to uniforms; your 'source' for white pompon centres on 1st battalions may be referring to the practices prior to 1811, in which case you'll need to review the above in detail for the specific pre-1811 year in question.[/i]