What's the diff btwn: SPX and INX?

The titles from my quote vendor say:

SPX - S&P 500 Index (CBOE)
INX - S&P Cash Index

That's fine but I really don't know what the difference is if there is one.

I have access to both and want to use one of them in a calculation. Wondered whether it mattered to use one vs. the other. They generally seem to be the same value most of the time but sometimes there are small differences.

Thanks,

- David
 
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