Some things to remember-
"EW" was made by Eaton Pond for Winchester.
SW was made by Sargent Co. for Winchester.
Operator.
New tooling Vs tooling that has been is use for a while.
These parts were taken from a Rebuilt carbine most likely, if you bought a Inland and it has a "EW" safety are you going to keep it on your Inland or put it on your Winchester?
As Charlie pointed out about finishes-
Original
light grey repark.
Medium grey repark
Dark repark
CMPItalian
carbines, dark black finish.
CMP Bavarian/Austrian reblued parts.
And the others that I missed.
All the marked faked safeties I have seen are pretty crude and easy to spot.
Scott
Scott