B Diminished :: B D F

F
C
G
D
♭5
♭3
♭3
♭5
B
♭5
B
♭3
♭3
B
♭5
B
⬤ ⬤
♭5
♭3
⬤ ⬤
B♭ Major 6th :: B♭ D F G

F
C
G
D
5
6
3
6
3
B♭
5
B♭
5
6
6
3
B♭
3
B♭
5
⬤ ⬤
5
6
3
⬤ ⬤