re: Ot engineers/construction guys

No, not really. Essentially they are the same thing but someone could call the top coverage but the bottom or sides clearance. But I could see how they could use the terms differently if they are sticklers for the coverage of concrete over the rebar but don't really care if the clearance off the ground or seal slab is a bit higher than spec. I'm wondering why on earth anyone would ever need to ask this question.