I know scoresandodds dot com shows the DTV channels for each game...that might help. e.g.
Overnight Pitching Change: Kansas City - W. Davis for L. Mendoza | TV: FS-Kansas City, Detroit, DTV: 663,672,732,733 | MOSTLY CLOUDY, WIND OUT TO LEFT 6-11. GAME TEMP 38,RH 85% WIND CHILL 32