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Yes, I have encountered that several times, big banana. Sometimes there has been a visual difference such as a different shaped knob or different coloured panel (both cosmetic) but other times the only difference has been the model number.
A few years ago there was a row of electrical appliance outlets next to each other at my local huge shopping centre - Curry's, Dixons, Millers, Appolo 2000 and a couple of others - making it easy to compare. They all offered price match and if there was a difference in price the model numbers didn't match, or there was some other difference such as an offer of interest free credit or trade in or free delivery.
Nigh in impossible to get a meaningful price match.