Have you ever attempted to align two ‘high level’ models? Sure there are likely to be features they both have in common – but then there is likely to be the rest of the model where things have been grouped differently, rolled up into different categories or described at differing levels of detail.
On occasion as a practitioner it can be tempting to forgo rigor and precision when asked to produce a ‘high level model’, especially when asked by a significant business stakeholder under tight timeframes and budget. However, in my experience the downstream consequences of getting a ‘high level’ model wrong can be significant.