I always thought Blade Runner had an aesthetic closer to alien than Syd meads previous work. His style before that was cleaner and sleeker. I think they were all influenced by alien. Then outland..
I guess it's was a melting pot of all that went before..
There's been a theory developing over time that both are in the same universe...
Scott did Alien then moved straight on to BR, I'm sure the style of the worlds were mentioned the in the very excellent Future Noir book by Paul Sammon but it's been about a decade since i went through that now.