Line each same loaf pan with plastic wrap, allowing wrap to extend over edges. Place raspberries, sugar and jam in food processor; cover and process, using 3 quick on-and-off motions, until coarsely chopped. Cut each loaf cake horizontally into 4 slices, using serrated or electric knife. Place 1 slice in bottom of each pan; spread 3 tablespoons of the raspberry mixture over each. Top with another slice cake. Repeat with remaining raspberry mixture and cake slices. Cover with plastic wrap and refrigerate at least 2 hours until chilled.