Not necessarily. Both can influence the upper surface, but a grill programme and a top-heat cooking programme may use different heating patterns or controls.
What the observation means
The distinction matters when a dish browns before its centre is ready. Selecting a grill because its symbol appears above the food can expose the surface to intense heat unsuitable for the whole recipe. Some multifunction ovens also combine a fan with grilling. The manual's function name is a stronger guide than the location of a single line on the selector.
A useful next step
Check the mode and approved door position before using either function. Never assume that all ovens grill with the door open or all with it closed. Report the exact selection when only one function has changed. An engineer cannot reliably infer which circuit was operating from a description such as 'the top setting' without the complete symbol or programme name.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.