It will sound pretty much like any other Recto running EL34's. The Recto and Stiletto preamp/poweramp circuits are worlds apart. IMO you'll need to throw a GEQ in front of the amp as well as in the loop in addition to EL34's to make a Recto sound like a Stiletto, and even then it would just be "close".
Throwing 6l6's in a Stiletto will not make it sound like a Recto either.
Comparisons of EL34 vs 6L6 in a Recto have been beaten to death around here. I'm sure you can find topics covering this with a little searching.
Dom