Native French speaker here,
same, I woulnd't pronounce "debt" the same way I would pronounce "dette" in French, and likewise for "doubt", which would turn in French "doute" ...
same, I woulnd't pronounce "debt" the same way I would pronounce "dette" in French, and likewise for "doubt", which would turn in French "doute" ...
The English t is also aspirated a lot of the time (though not as consistently at the end of a word as at the beginning), while the French t is never aspirated.
There could be differences between the two short e sounds as well, but that depends more on which particular accents of English/French you're talking about.