Mahomes really likes Robinson, and so does Reid. I'm guessing he's one of those guys that light it up in practice. However after the week 1 performances I'm expecting some of his role diminishing rather quickly.
Overall Robinson has been considered more of a possession receiver while Hardman has been used like an outside threat as well as "offensive weapon" similar to DMC or DAT, I don't think their roles are interchangeable but we could see some changes in the scheme with Hardman getting more looks.