In those quotes, they are both imperial.
You need for them to quote you on metric size. 1″ is 25.4mm, so that is too large in diameter. The 3/4″ would be much too small.
They need to quote you 25.00mm OD Tube and 1.5mm wall. The 1200mm would only be approx 1 foot longer then what I’m working with, so it should be fine with that wall thickness. But it down come down to what you will be using the machine for!