This is an easy issue to resolve.
When using comparative feats against other characters (abc logic) then it should be assumed that the characters were operating at average levels in that comic (unless other evidence exists). For example, let's assume Superman's typical average strength is around 10,000 tons. Anyone that matches him in a comic, with no known upper bounds to their strength, then we can assume they are equal to Superman's average.
It by no means imply that they have Superman's top objective feats. So the statement, "since Orion matched Superman and since Superman once lifted the Earth then Orion can lift the Earth" is extremely false.
A character's feats can be used to HELP establish an average in order to use abc logic.
With that said, IMO Orion is a peer to Hulk in strength on average. So other factors would be considered who wins a particular kind of fight.