I was comparing the regiments in the full campaign games and noticed the following:
63rd Foot initial at Boston
63rd Foot again in May 1775 reinf
45th Foot initial in Great Plains
45th Foot again in May 1775 reinf
49th Foot initial in May 1775 reinf
49th Foot again in Dec 1776 reinf
I suppose it's possible these are just two battalions of the same regiments arriving at different times but I'm not sure.
Looking forward to the up coming patch.
Thanks