Reload PowerShell Profile

When editing your PowerShell profile, you need to reload the profile to check or implement your changes.  There are three ways to accomplish this.

1. Start a new PowerShell session
2. Type the command & $Profile
3. Type the command . $Profile

Way one is inconvenient.
Way two invokes the $Profile script.
Way three sources the $Profile script.

Are two and three really different?  Dunno, the end result is the same.