I am not someone to complain about someone complaining, nor do I think that complaining is an act of being annoying or unreasonable as some people do.
The inquisitors look different, infact they look really quite different. The shape of there face isnt that hard extravagent, the grand inquisitor just has a longer face with pronounced cheek bones, thats not uncommon in humans, I cant believe that disney cant find an actor that looks more similar. They cant just say 'oh it will look different' because as far as I can tell they havent made any effort to make them look remotely similar.
My point is, with cad bane it was okay because he is a different species and an anamatronic, but the inquisitors are pretty much humans with lines on there face, its not that hard to find someone who resembles the rebels version, Lucas managed to find someone in Revenge of The Sith.