Considering the broad mandates of both NSIRA and NSICOP, there is a potential for overlap, especially in what they review for. They both could technically review issues related to efficacy, compliance, innovation of agencies.
They're geared toward different things. For example, the parliamentarians have a diversity of expertise, so they would be very useful in reviewing legislation. According to Bill C-59, NSIRA is made up of former SIRC members. They have the experience and intelligence accountability to look at things that are more geared to compliance. However, there probably will need to be some kind of delineating of responsibilities to prevent overlap and the minimization of duplication of work.