Hi Antonio,
I have not tried the Fender Noiseless pickups, but I don't think they would sound the same as the FAT 50s in the USA Standard Strat. I do have a USA Standard Strat, & it gives the usual Fender bright sound that we all know.
The Noiseless pickups have different specifications. 9.8k ohms & Alnico II magnets :
http://intl.fender.com/en-GB/guitar-bas ... ged-white/The Fat 50s have Alnico V magnets & are around 6 - 6.3k ohms.
http://intl.fender.com/en-GB/guitar-bas ... -set-of-3/This would suggest that the
'Noiseless' set would be louder & fuller in the Mid-range, leaning towards a typical humbucker pickup tone, & would drive a valve amp at a lower gain stage. I believe these are the type of pickups on the Eric Clapton Strat, so expect his tone.