Compare
Melodic Minor vs Natural Minor
Classical melodic minor ascends with raised 6th + 7th, descends as natural minor — same scale, two patterns.
Melodic Minor
R
♭2
2
♭3
3
4
♭5
5
♭6
6
♭7
7
Natural Minor
R
♭2
2
♭3
3
4
♭5
5
♭6
6
♭7
7
What's different
Only in Melodic Minor
67
Only in Natural Minor
♭6♭7
In both
R2♭345
Other comparisons