I’ve removed the old toilet and positioned the new one to confirm that the outflow and floor waste meet up. It’s not yet secured to the floor. This needs to be done by you. The cistern in flow does not align perfectly with the gap in the back of the cistern. Arox 1-20 mm out. Needs adjustment to length of on/off valve , or a flexible hose with on/off valve or worst case adjustment to pipe position. Or worst case small grind out to cistern.