Thinking about buying a S&H MP5 and want to use the lower with a vector arms v93 and a special weapons SW32.  Understand I have to change the hammer spring but what about the ejector lever. Is there a difference from the 223(V93) lever to the 7.62(SW32) lever.   Really do not want to change levers to use in both guns if I can leave one or the other in the lower.  I know the 9mm is different but what about the two others/

The original SW32/52 use a .308 ejector. The SW32X/53X series use a .223 ejector.
Special Weapons can modify an original to X specifications.