Noticed difference between Hologram Engineers and Pilot Engineer

I think it shows these suits have multiple purposes, and i think it was a bit of a oversight but i guess they had to do the Suit attached to the Pilot Chair Scene to show how the hose/snorkel attached to the Chair etc.

The Original idea from Spaights Draft was the Engineer entered a Chamber where he got suited up, and then he went to the Chair already Suited.

Of not too is in the other Hollogram Scene, one of the Engineers was carrying a Space Jockey Helmet yet he never had the full suit on, only the Pressure Suit underneath.

@BigDave: And that’s the problem, i.e. if an oversight, it leaves the question/ contradiction (like if Ridley intends the SJ to be an Engineer, the size is completely wrong).  That is, Spaight's draft’s intention doesn’t matter a wit if something quite different is implied on screen.

As for the later hologram in the cockpit, was this group of Engineers the same group we saw earlier fleeing the 'outbreak'? If so, why would the others be fleeing and the living Engineer have remained in this room, if the 'outbreak' scene occurred after this second 'hologram'?