All Valve made games use the same map file base....BSP.
As long as you don't have any models that are particular to one game (css, dods, blah blah blah), and the spawnpoints are added for each game (info_player_terrorist, info_player_axis, info_player_combine or whatever...) then it will work.
If you have say...a css model, like a vending machine from Cs_office, it will either crash DODS, or just produce an ERROR model....I can't remember which, but yeah....I think you get the point.