Yes, I think that if it did go ahead earlier, it would probably still have failed.

After having the German attack confirmed by the Lucy spy ring, Stalin and some of the Red Army Stavka wanted to strike first. But the majority of the Stavka, and notably Zhukov, advised waiting for the Germans to exhaust themselves in their attack first. Zhukov's opinion swayed the argument. [thank God]

The lead up to the operation was a complete shambles from the German side, and this time it seems it was the Generals, not Hitler that were the main offenders.

Hitler seemed to have cold feet at this stage, and wasn't sure what to do, Manstein wanted the 'Backhand ' operation, but this meant giving up hard won ground, something Hitler loathed, and then Chief of Staff Zeitzler put forward cutting off the Kursk salient, which Hitler agreed to and wanted to move by May 4th.

But then the Generals such as Guderian, who's objections were at the strategic level, whether Germany should attack at all, not whether the plan itself was sound, and latter Model, who kept arguing against it, made Hitler delay it until June 12, and finally until July 4 in order to allow more time for new weapons to arrive from Germany, especially the new Panther tanks.

Would the strengths for the Kursk front of about 900,000 Germans with 2,700 tanks, 2,000 aircraft vs the Russians 1,300,000 men 3,600 tanks and 2,400 aircraft be close?

Still can't find accurate losses though.