IFC format version in ORD


please where can I find information about IFC version which is used in ORD 2020 R2. I know that I can see it inside file in header and also in ECSxhema IFC file transform. But I need to know as much as is possible to better understand how it is working with colours, properties, geometry. Please is here some IFC expert who implemented IFC in ORD

Thank you a lot

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