I will say that getting the wrong bulb out was a bit of a job and I broke it. I think there is a design to prevent it but I managed to overcome it in my poorly lit fumbling
What should prevent you fitting the wrong bulb is one has offset locator pins and the other has 'level' ones.
However, with some bulb holders I think it's possible to fit the wrong bulb, leaving it held in place (not very securely) with just one pin.
Doing that clearly means you are no master mechanic, but it doesn't make you a total duffer either.
To complicate matters, there's also a much less common single filament bulb which has a smaller glass bulb, but uses the same sized metal holder.
I used to do lots of bulb swaps in my days as a Saturday boy mechanic.
Jamming the wrong bulb in place and having to break it to remove it rings a bell.
Lots of tales from those days, including one customer who thought the engine oil filler was where the water went, so topped up his engine with water.
He drove the car to us where we drained a couple of gallons of emulsion.
The engine ran fine after we restored oil and water to their correct locations.
A sad postscript to that one.
The same customer - a retired army officer - rang us a few months later to say he'd parked his car somewhere but couldn't remember where.
Turned out he was suffering from progressively worse dementia, which probably played a part in the oil/water incident.
