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[X-Men movies] How did Trask go from a midget in the 70s, to a tall black man in the not so distant future?

If I understand it correctly, Trask would capture mystique, and use her cells for the sentinels if wolverine didnt go back and change things, thus leading to the original three x-men movies. But how can Bolivar Trask go from a white midget (Peter Dinklage) to a tall black man (Bill Duke) in around 40 years?
gpt
Bill Duke's Trask is the adoptive son of Peter Dinklage's Bolivar Trask. During the events of X-Men: The Last Stand DinkTrask is killed by one of Magneto's mutant army. DukeTrask is devastated by this and uses his position in the government to get information of Stryker's experiments, then quits to focus on the legacy of his adoptive father: Trask Industries. (This is why we see a Trask Industries commercial in the airport scene at the end of The Wolverine).  
Everything went out of control and was taken way too far, and he wishes he could find a way to undo it. This is where he finds a mutant who can actually time travel and somehow extracts his ability. He uses this to send a message to DinkTrask in the 50s. This message is basically 'mutants are bad' but also a lot of technology and information. (This allows DinkTrask to make Sentinels in the 60s and the ripples this causes in the timestream cause the changes between original trilogy-new films)  
**TL;DR: They're two different people.**