It can change the food's distance from the heating area and the air space around it. The supplied pan and grid are part of the intended arrangement.
What the observation means
A deeper substitute may fit the rails while placing food at an unsuitable height. Fat collection and handling can also differ. The same control setting does not compensate automatically.
A useful next step
Use the approved compatible pan and shelf position. Record any substitution if browning or smoke changed. Do not balance a tray on extra racks or remove a guard to obtain more clearance beneath the grill.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.