The following is my own review of the music I downloaded. I hope it will be helpful to you. Your serial numbers should be the order of the works, not the serial numbers of the works. I thought they were the serial numbers of the works, so I thought you were mistaken, but it is not true, haha.
It is now marked O(∩_∩)O~
1. 5：28 Waltz No.1 Op.18 in E flat major 'Grande Valse Brillante'
E flat major Waltz in A flat major (10)
2. 5：07 Waltz No.2 Op.34 No.1 in A flat major 'Valse Brillante'
Waltz in A flat major (10)
3. 5:17 Waltz No.3 Op.34 No.2 in A minor 'Valse Brillante'
Waltz in A minor
4. 2: 25 Waltz No.4 Op.34 No.3 in F major 'Valse Brillante'
Waltz in F major (10)
5. 3:48 Waltz No.5 Op. 42 in A flat major
Waltz in A flat major (10)
6. 1：53 Waltz No.6 Op.64 No.1 in D flat major 'Minute'
Waltz in D flat major (8)
7. 3:44 Waltz No.7 Op.64 No.2 in C sharp minor
C sharp minor Waltz (8)
8. 3：24 Waltz No.8 Op.64 No.3 in A flat major
Waltz in A flat major
9 . 3:30 Waltz No.9 Op.69 No.1 in A flat major 'L'Adieu'
waltz in A flat major (8)
10. 3:54 Waltz No.10 Op.69 No.2 in B minor
Waltz in B minor (7)
11. 1：53 Waltz No.11 Op.70 No.1 in G flat major
Waltz in G flat major (10)
12. 3:31 Waltz No.12 Op.70 No.2 in F minor
f Waltz in D flat major (7)
13. 2:51 Waltz No.13 Op.70 No.3 in D flat major
Waltz in D flat major (8,9)
p>14. 3：05 Waltz No.14 Op.Posth. in E minor
E minor waltz (10)
15. Waltz in E major (Posth)
Waltz in E major (8, 9)
16. Waltz in A minor (Posth)
Waltz in A flat major (5)
17. Waltz in A flat major (Posth)
Waltz in E flat major (8,9)
18. Waltz in E flat major 'Sostenuto' (Posth )
Waltz in E flat major (Posth)
19. Waltz in E flat major (Posth)
Waltz in A minor (8)
The first number is the order, then ABCDEFG represents the key signature, and mirror represents the minor key.
, major represents major, flat represents flat.
For example:
The first piece: 1. Waltz in E flat major, Op 18 means "Chopin's Waltz in E flat major, Op. 18."
Second piece: 2. Waltz in A flat major, Op 34 No 1 means "The work No. 1 of Chopin's Waltz in A flat major, Op. 34."