Question about AD Converters in 192 i/o

[groovebrother]

Hi all, i noticed that AD converters built around 2000/2001 in 192 i/o's where quite different with the ones built after 2003 mabe 2005 i don't know.
They are not built with the same components.

Which brings me to the point i don't have same audio definition or color when A/B a mix through the 2001 & 2005 192.

So my question would be is there any known issues with adding an old 2001 AD converter into a more recent 192 and vice versa ?

Other question : is there a way to date an AD converter ? On the bottom of 192 i/o there is a sticker which indicates the production year, so mabe with the sérial number i thought there might be a way to date AD converters ?

Thank you for any light