yes I have read saski.
AnXi guns in 1809, my sources:
26th May 1809. replace 8-pdrs with 6-pdr, remove the old 6.32 howitzer with the 24-pdr Clarke to Songis letter dated 26 May 1809
Inventory of foreign guns in the artilery to made so they could be replaced.
36 new guns of the new design sent to the guard artillery Clarke to lariboissiere 16th May 1809
60 guns cast and made to the new system sent to the artillery then in germany, in total 200 6-pdrs of the new design were to be with the army. Clarke to Napoleon 8th July
30 new guns of the new design cast at Alexandrie to be sent to the 4 and 5 battery 4e line foot artillery and 2 and 3 battery 1st horse artillery. Clarke to Napoleon 16th July 1809 CC to lariboissiere.
86guns of the new design had been sent to the artillery in german. Clarke to Napoleon 8th August 1809. of these guns 24 were sent to the guard artillery.
Guns and caissons of old designs not replaced after peace of vienna to be replaced. Lariboissiere order 7th February 1811
Gribeauval guns to be used in spain as france and spain used the same calibres. Clarke to Songis 9th January 1808
Thus from the recomendations of the Minister of War acting on Napoleons orders we see that AnXI guns were used before wagram and replaced all guns not AnXI designs. The 155 6-pdrs requested by Napoleon were cast by 8th August 1808. The howitzers were also replaced. The 12-pdrs were not replaced it seems till post 1809.
The guard had AnXi 12-pdrs and guns of the new design from the outset(Clarke to Lariboissiere 7th june 1809)
Unless their is evidence to the contrary that none of the guns mentioned by Clarke did not exist, that a programme of replaceing Austrian 6-pdrs and 8-pdrs was started in May 1809.