In Marvel, Mephisto, Marduk Kurios (usually called Satan), Lucifer, Satannish, and many, many other Hell-Lords have claimed to be THE Satan at one time or another. To make things even more confusing, there is a theory that in the past, these big bads have temporarily merged their forms to create a "Satan" figure when they wish to do something of mutual importance.
In any case, it is next to impossible to determine who was which Satan in every appearance, unless it is actually said.
As for the Ghost Rider movie, that was definitely Mephisto.
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