WCWS: mechanics?

[LMan]

question for Mike Rowe or other authorities.... Im not a softball ump (obviously), but as I watch closely on TV (picking up thoses umping tips, yes!) all the umps seem to have the EXACT same mechanics (strike, out, etc). If I didnt know better, Id say the EXACT same person was PU every single game! Are they instructed to match their mechanics for purposes of the tournament, or are SB umps always like this? Just wondering...