The ‘normal’ or at least most typical layout for the Explorer is with the magnifier/phillips layer next to the openers. It is also the original order from 1973:
The spacer/collar on the 4th pin is used in that layer from ‘81-‘86. The OP’s knife appears to be from ‘83, from what I can see and would expect it to have the non-beveled bezel and no eyelet on the awl and for there to be no tip grind on the awl. If it doesn’t have the beveled bezel, then it’s probably ‘84.
The other Explorer is ‘00/‘01.
Passenger looks nice and I’m wondering if it’s an Alpineer?
But the Yeoman looks a bit odd to me and wouldn’t think it’s original. I’m not familiar with the ones in this arrangement...though the ‘construction’ doesn’t seem correct to me.
I’m not sure why they used this ‘intermediate’ arrangement. But I believe it was short lived for the reasons Altis mentions above.
More pictures would help to confirm my date estimates and maybe the suspicions about the Yeoman.