firstly I dont know if thats a genuine Monza they have refurbed , ask them to show you the stamps on the other side.
Anyway the nature of machining the face means that some material always is removed and some features can and do change. edges , wheel nut holes etc
It also means that certain types of wheel can only be refurbed once before it cant be done again (and usually means you have to powder coat rather than machine)
Normally you have to get at least 1 side of the car done (2 wheels) but pref all as they never match 'exactly'
Id be tempted to buy off ebay or dealer for a new Monza if its only 1 you need....