In Gotham By Gaslight. the change worked and I did not see that coming, jack the ripper reveal was a total surprise. and it's an Elseworlds story so small change does not matter if the outcome is good.
Hush on other hand should have stick with an original hush. though agre that it's adaptation so there will be few changes.
If they have given sequal of Hush based on Heart of Hush storyline and bringing back original hush it would be good but that's not going to happen.
I have hope that Long Haloween, will adopt with the source material, but there will be some changes from comic, that's for sure.
though killer will be reavel in second part of movie.