Ferocactus - all plants one species?

[Arash37]

Hello. I wonder about my cacti. They are probably young Ferocactus. But are all of them one species? They look similar but there are small differences in the colour of the bodies, size of spines, number or ribs.

[A1essandro]

All of them are Ferocactus glaucescens I think.

[majcka]

All of them are Ferocactus glaucescens I think.

Same here.

[Arash37]

Thank you for your answers.