If i did the math right, you need 37% Equity and that is, what you have, if we give them this range.
Board: 3♦5♥4♥
Equity Win Tie
MP2 26.03% 25.35% 0.68% { 3h3c }
MP3 36.48% 34.61% 1.87% { 55-44, A2s, 76s, AhQh, KhQh, AhJh, KhJh, QhJh, AhTh, KhTh, QhTh, JhTh, Th9h, 8h7h, Ah3h }
CO 37.49% 35.62% 1.87% { 55-44, A2s, 76s, AhQh, KhQh, AhJh, KhJh, QhJh, AhTh, KhTh, QhTh, JhTh, 8h7h, Ah3h }
IF both players have overpairs, thatn it is enough.
Board: 3♦5♥4♥
Equity Win Tie
MP2 43.32% 42.25% 1.06% { 3h3c }
MP3 30.08% 28.68% 1.40% { QQ-TT, 55-44, A2s, 76s, AhQh, KhQh, AhJh, KhJh, QhJh, AhTh, KhTh, QhTh, JhTh, Th9h, 8h7h, Ah3h }
CO 26.60% 25.20% 1.40% { QQ-99, 55-44, A2s, 76s, AhQh, KhQh, AhJh, KhJh, QhJh, AhTh, KhTh, QhTh, JhTh, 8h7h, Ah3h }
Vs an unknown i wouldn´t call.