My Hudson actually fits considerably slimmer (As slim as a Washington fit) than my Havana, my Hudson (28.5") is also 1 full inch longer than my Havana (27.5"). The shoulder and sleeve measurements are pretty much identical though.
I really do think this is a one-off thing as I've tried on a Hudson which fits similarly to my Havana, as well the general consensus on here being that they're pretty similar.
Thank you. It seems like I will have to take a leap of faith.