this is only theoreticly, and i don't know if i can explain this correctly... but:

if i use, say, a fractal axe-fx in the input of my effect loop on my engl amp, would it be the "same" as using it in a marshall EL84-20/20 (exept it would be an engl poweramp ofc)?
in other words, not using the preamp in the engl at all?
and in that case, will the EQ on the engl have any effect on the sound?

(bad english and bad explenation, but i hope someone can still answer me)