I would say it's less. The heat is very concentrated, and it's not necessary to add much filler rod... that makes for a smaller weld bead with less mass..... and less heat. In comparison, MIG adds a lot of metal to make a bead.
Nice thing about the TIG weld is it's less work to finish it off....less metal to grind off, if any. Once it's flat, go over it with hammer/dolly to stretch the metal back to where it should be. Do this constantly during the weld length as you go..... weld a little, grind flat, hammer/dolly, weld some more, etc, etc.
There's a great thread on welding in panels on the Garage Journal board. He uses MIG in this example but the process is the same.... tack, grind flat, planish (hammer/dolly), repeat.
https://www.garagejournal.com/forum/threads/mp-c-shop-projects.182565/I haven't TIG'd much yet in the way of exterior body panels.... that's coming. Mostly floor, trunk, and rear inner fender repair so far. I did do a long weld to replace the windshield channel. Constant hammer/dolly work during the weld process kept it nice and flat.
Here's an example of one of my better moments next to a more troublesome spot that was thinner and kept burning thru. When it's good, it's just beautiful! When it's bad, there is always the grinder!