“Pré” and “prè” consistently sound distinctly different in most, dare I say almost all, accents in mainland France. The difference is the same with basically all words spelled with those vowels. “Ê” also sounds like a long “è” in most words for most people. “e” also sounds like “é” when before silent letters except for “t”, and sounds like “è” when before multiple letters or before “x” or before silent “t” or if it’s the last sound except for open monosyllabic words, and it sounds special or is silent elsewhere. “-ent” is always silent too. Obviously doesn’t apply to “en/em”, also special exception for “-er/-es”.