That doesn't bother me at all. Both Chromedome and Blurr end up as totally distinct bots and vehicles, so a few minor parts shares is all good. Also, if a bit of mould-sharing helps HasTak spread the budget over more characters, I'm perfectly ok with that.
As for my thoughts on Domey, I like him. Took the basics from the best of the two CW sedans, and improved on them, adding actual feet, a bumper/bonnet section that folds in to the body much better, a moving canopy for the Titanmaster, and due to the TM, much better head articulation