The timings are pretty much the same, so I think it's a fair bet it's the same performance.
One HUGE missed-opportunity was Decca not pushing Zubin Mehta to do a Mahler 8 while in his prime. I know, I know, Decca already had the Solti one, but I think Mehta would have made one with more warmth and humanity. More to the point, he had a real rapport with so many great singers.