As the playfield layout is the same as the original, no doubt the game will have a great feel regardless of the components used, & may very well have a very similar or better feel with new designed parts as a dialed in original game with the added benefit of reliability with modern architecture & all the other options.
In terms of different style mechs used, for example, on an original game if you swap out the linear style flipper assemblies to the very different old style flipper mechs (common mod) you will find the game feels quite different, but it's still essentailly the same fun game with both - it doesn't suddenly not feel like a Fathom, what's key is the layout, the sounds (especially when the second level is reached) speech & multiball flow - when it all comes together.
I don't think new design mechs or other components will change that (in any negative way)
I think it would be good if the unused speech phrases that are present in the original Squawk & Talk ROMS were used. The existing home ROM version uses these phrases & it fits perfectly in the original game format.