That I don’t know. I’ve been trying to identify when the British Army stopped using elite flank companies (lights and grenadiers) and I haven’t even been able to find that out.
Flank companies were abolished in the 1860s.
Concerning the other question: Company numbers in the Crimea were effectively doubled at one point, with 8 field and 8 depot companies per battalion. Battalions per regiment also fluctuated through the century. Company manpower strengths were fiddled about with too. This isn’t a subject that has a one line answer.
"I'm not signing that"