It's almost like sitting at a keyboard and typing is different to driving to a site, lugging a drain snake off the back of a flatbed, asking the owner where their outside tap is, cutting the dead bush away so you can reach that tap, finding the drain, snaking the thing down the drain, monitoring it all, not making a mess in the customer's back yard, packing it all up, and driving away.
I mean they're basically the same job.