What valve combinations on a trumpet would be the same key as the bugle?

If the bugle is in the normal key of B-flat, then the notes played by the bugle correspond to the open notes of the Trumpet - no valves pressed down at all. If the bugle is in a different key than the trumpet, you will need to transpose the bugle notes into the key of the trumpet to find which notes to play on the trumpet. After you have done the transposition, it should be the case that the same valve combination can be used for all the bugle notes in that key.