No way. DeAngelo had/has maturity concerns and doubts about whether he'd ever commit to the defensive side of things. He seems to have sorted out the former while the latter is a WIP. DeAngelo has been more of a "personal commitment" type of guy.
Day on the other hand, has one plus tool and then a whole bunch of questions marks about things he can't correct simply by dedicating himself--does he have the vision, the sense, the anticipation, the general on-ice awareness, to succeed as a defenseman in the pros. Jury is still out.
I also don't think they have similar upside. I think ADA's upside is leagues above Day's, at this point. And I say this as someone who hasn't exactly been a cheerleader for ADA.