More than one Facehugger means no Egg as far as I'm concerned, otherwise showing it is completely pointless, other than showing the audience in a sort of non-diegetic way that the Alien species is present.
As for how egregious the location detail change is, I think it's closer to Logan's claws being bone at the end of The Wolverine and then metal again in Days of Future Past. It's not quite Fury Road level or 343 Industries first Halo level changing the artstyle completely, so when Master Chief awoke, it only kept the core concept.
The most notable change is the design of the Cryotubes. It's just artistic liberty, like the redesign of the Sulaco for the EEV, the designation for the Sulaco written in white on the outside because of the colour tones and the inside of the Sulaco's more hospital white tones, it's just representative.