The worktop cutout, support, clearance and supply requirements can differ between models with similar outer dimensions. Replacement is an installation decision as well as a shopping choice.
What the observation means
The existing seal or trim can hide the true opening. An owner should not remove the hob to measure around connected services.
A useful next step
Use available installation records and obtain suitable fitting advice. This breakdown service does not automatically include new installations. Do not enlarge a worktop opening or alter wiring before the replacement's requirements have been properly assessed.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.