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I can see some very small y deviation which would probably sew together ok with no gap. However if you want to get no deviation set the Trim Blend setting to "To Long". You will have to trim the base faces later but this is fairly common in surfacing.
Hi @Paul_Hartrick Thanks for your reply!
In the case the base faces are exactly sized and therefore should not be trimmed. And "To Long" is unavailable.
when I make a symmetrical aesthetic surface, I try to make it whole to avoid continuity problems.
In the example I propose on the left there are three surfaces, two whole and one made with a tangent constraint. On the right the two whole surfaces are trimmed and then mirrored, the third only mirrored.
In all the three surfaces it is noticed that there are a discontinuity.
Therefore, even if there is a small asymmetry in the whole surfaces it can not be seen.