Well, the 4 stages have 2 aspects on each stage: path and fruit. When you are practising the path, you are still practising for the attainment of the fruit, which are are bound to realise in the same life. Someone who is on the 2nd Bhumi is roughly equivalent to someone at a certain point on the Path of the Foe-Destroyer - they have destroyed all the defilements, but what lies between the point in the path where they are, and the fruit, is knowledge and realisation. The difference between the 2nd to 8th Bhumis is all knowledge and realization based, since defilements are left behind at the 2nd Bhumi. As for the other three, they'd all fall under the 1st Bhumi, since by the 1st Bhumi you have already realised emptiness, which is roughly speaking the elimination of "identity view" that the Stream-Enterer has eliminated. But it's important to remember that they're not identical, there are differences in quality between all these because the motivation is different, there are many realisations that must take place if one is transitioning from a Foe-Destroyer to an Awakening Hero, realisations particular to the path of the Awakening Hero.