Remember they have to be also dry until first buds will appear and don't turn the pots because it's also very important.

C radians IMHO (commercial, thick, overfertilized)

Hildewintera colademononis, needs much more sunlight.

Such things need extreme surgery. If plant is still alive.
Dead tissue has very sharp borderline.
What's white powder under the areole, mealies?

Lobivia winteriana
Ferocactus horridus / townsendianus
Mammillaria mendeliana/ bravoe
Matucana krahnii
Mammillaria polythele
L ferox

1st probably G andreae with yellow flowers.
2nd mb C radians IMHO

Microhelia has white/yellowish flowers, microheliopsis has pink ones.
P- penicillata nivosa.

2nd Mam. hamata or duoformis IMHO

Some years ago I collected more than 20 different hoyas in searching of "ideal fragrant plant". Hoya lacunosa won a competition (nice strong fragrance, very prolific bloomer!) and I got rid of many others because their growth was very abundant and our house windows turned into jungle. :) O...

I had a bad trouble with customs when ordered 5 small decorative garden hybrid orchids from Thailand.
The same CITES restrictions.