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So Blade Runner & Alien must take place in the same universe(r/movies)
The screens are the same because they were both done by Douglass Trumbull, Dick Yuricich and Ivor Powell (who also did 2001, incidentally; there’s a reason the same screens appear in 2001 also). Not only that, but preproduction called for $5.5m in FX and the actual budget came in at $2m. Additionally, Trumbull and Yuricich had just started EEG, and in order to make the budget even smaller, they dropped a bunch of shots and patched up what they could, as well as leasing everything EEG owned (such as the props from Alien).
"That was the point where all the original opening effects scenes that had been storyboarded by Sherman Labbey or painted by Mentor Huebner - the replicant's escape from the furnace asteroid, the scene of Deckard landing on a farm at the beginning of the show - were cut from the film," Trumbull relates. "One sequence I was particularly sorry to see go had Deckard arriving in Los Angeles from the desert on this futuristic train. He got out at Union Station in downtown LA and then got into his car, which sort of flowed out onto this automated freeway which could control a vehicle's speed and direction independently of its operator. But then Deckard got caught in this horrendous traffic jam. So he set his car on autopilot, got out, and walked over to this huge tower that looked something like a concrete mushroom. There he entered an elevator and exited on top of the tower and waited on a ramp, where a police Spinner flew down and picked him up to carry him to police headquarters."
– Future Noir: The Making of Blade Runner By Paul M. Sammon, 1996, pp. 221