It has been translated, by Charles Patton, and is on SuttaCentral. 
Having looked at it, I actually don’t think there’s much difference in meaning. MA 204 still has the Buddha practicing sati and samādhi in seclusion. It actually makes it more explicit that he practiced deep meditation than MN26 in my opinion.
Before he had attained the dimension of nothingness, he realized that he had faith, energy, and wisdom — just as his teacher — and that he should use it to experientially verify the attainment. That would mean, at this point in the narrative, he specifically does not have samādhi or really practiced sati. He is using the basis of faith in the teaching, his energy, and his wisdom (presumably about theory and mental discernment) in order to attain it, assuming he is capable because he has the same skillset his teacher had before attaining it.
So MA204 still attests to sati and samādhi. It lists the 3 faculties before the Buddha had these last two. I would follow @sujato here then in the meaning, but @Brahmali in phrasing, as the MN26 phrasing makes less sense: the Buddha didn’t necessarily have samādhi yet before realizing the attainment.