Retaking SAT without essay?

Okay so, I took the SAT this summer and received a 780 in reading/writing with essay and 610 in math. I wanted to retake the sat so i can improve my math score. However, if I happened to score an 800 on my reading/writing the second time around but DIDN’T take the essay again, how would my old score compare to the new one? BTW this is all with the new SAT

You left out a key detail: what did you score on the essay the first time?

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