CFDs data vs real data (CMC vs Yahoo Finance)?

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Hi,
I'm new at trading and considering trading Indices via CFDs. I wanted to know where I can find historical data for indices that the CFDs companies use?

For example:

"All Ordinaries Index" indice from Yahoo Finance does not match the graphs from CMCmarkets for "Australia 200 Cash" exactly. They differ in opening / close / high / low, but only slightly.

Another:
Euronext BEL-20 Index (Belgium) vs Belgium 20 - cash (CMC markets)

Am I comparing the wrong instruments or do the CFD companies select their indices differently?

Where can I get the same data that CMC (or IG) is using?

Thanks!
 
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