There is definitely one (and only one) of the refurbished 365s where the auto announcer still says "Welcome aboard this West Anglia Great Northern service to...". Also appears to have a slightly different wheelchair space and a different hustle alarm tone.
Yes, it did have the different hustle alarm. Also different door buttons (which look real cheap and flimsy) but I don't know if it had the newer accessible toilet, which is huge but has the toilet tucked in the corner that seems surprisingly inaccessible!