Working within the Consumer Market, I deal with great candidates on a daily basis, either looking to move from Agency to Client Side, or Client Side to Agency. 

Whilst here at PIE we recruit purely Client Side roles across FMCG, there is definitely a crossover and skills can be transferred across to either. (In fact, we've just been voted 'Best Client Side Recruiter' by The Marketing & Digital Recruitment Awards!) 

Yes, sometimes it's harder to come from a Category Management Agency Background into a Client Side position, but it's doable and even more so with Shopper Marketing & Customer Marketing positions. 

This is a really insightful article, with helpful views on both.