A new type is considered a significant change. As with UKSAR TUPE isn’t worth the paper it’s written on. Ditto for Humberside when Bristow took over there, the great Norwich fiasco when Dancopter lost to CHC and the pilots all got no job and no redundancy either. Years in court and I can’t even remember how it ended.
Maybe the new provider does not want to inherit culture and attitudes.
Regarding range and time on scene claims for 189 v 92 maybe somebody might want to ask a current UKSAR pilot with time in both types for real world figures. I believe one has recently posted his 189 experience here.