Why do the nonlinear results for SOLID186 and SOLID226 not match?

"Solution Control" (SOLCONTROL) is adding displacement as a convergence criterion to the SOLID186 solution, and that results in additional iterations. Solution Control is not used by SOLID226, so it just has a force convergence criterion, which for this problem is equal to MINREF.

If I add "CNVTOL,U,1,1e-4" to the SOLID226 solution, the difference in the results disappears.

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