Welcome to the crazy world of variations - sometimes miniscule, sometimes plainly obvious...
look closely and you'll see differences in: light/dark colors... thick/thin printing... mint mark /
no mint mark... wording (hotel/casino vs. casino/hotel)... same inlay/different mold...
cancellations and so on... here are some (non-Las Vegas) Nevada examples...

I'll show some Las Vegas examples in my next post... let's see some more of these variations!