What a great looking Bristol!
If similarity of lines is the reason for your (tongue-in-cheek?) question, I suggest you think about the similarity of lines between most widely-sold makes of cars during different eras.
Even a cursory glance shows there is no doubt that designers, probably to some extent at the urging of management, copy one another's lines. At least, until for some competitive reason, a maker desides to break away with another idea or so.
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