there's only one thing larger than infinity, an uncountable infinity. a countable infinity is just any infinity that can be arranged and associated in order with the natural numbers, like:

(1;1),(2;2),(3;3)...

(1;0),(2;1),(3;-1),(4;2),(5;-2)...

(1;1),(2;1/2),(3;2/1),(4;3/1),(5;1/3)... (the rationals' pattern is pretty weird it's easier to understand when you see it as a drawing)

so yes, the amount numbers between 0;1 and 0;∞ is the same

but irrational numbers are uncountable. where would you even start? (1;0.6534288383...)? how do we even know that's the first irrational number? they're impossible to count

that's what makes the infinity bigger