If you are really using the IPA symbols, yes, there is a big difference. /e/ is a closed vowel; /æ/ is an open vowel. 'Sat' is the past tense of 'sit'; sate is a verb meaning 'to satisfy'.
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Berton Sorry. I used the wrong symbol. What I mean is /?/ and /æ/.Indeed, they are much closer, and I can understand your confusion. Bet~bat; set~sat; met~matt; pet~pat; vet~vat. I can only suggest that you find a native speaker who can give you oral examples. Briefly, the /æ/ sound is more open, that is, the mouth is open in a wider position. You might gi