Hi arael has more experience with revoltech evangelions but i'll try to answer you anyway.First and foremost, yes, they are all from the same series, but not the same line.
The first links you showed, eva 00 through 03, are from the evo eva, wich is revoltech new body mold, with adds a little more moviment range and includes more acessories like a display base.
Eva 02 beast mode was from the older series from evangelion 2.0, as is the box with all 4 evas, i dont remember if they include all the extras that originally came with the figures, the coins are usuless to you, they are suposed to be exchanged for another figure in Japan, like say you have 80 revoltech coins you trade that for a new figure or half the price on a new aquisition something like that, only in phisical stores. Also be minded that this first line of revoltech 2.0 had eva 03 as exclusive, so this is the best way to find that particular mold now.
eva 04 is also exclusive so getting it with mark 6 with the corrected coloured lance would be the best way for you to go, just be minded eva 04 is not the same mold of mark 6 eva evo neither the revoltechs from 2.0, it is the same old one from nge evangelion from like 8 years ago with only a lance of longnuss instead of the original riot shield it had.
My personal opinion all revoltech sucks, but the new ones suck even more, i think the "face" esculpt and body mold of evo eva are inferior to the ones released for eva 2.0, but they include custom stand as gimmicks, and revoltech is more prone to release the new evas from the Q movie that other brands, just pray they dont release them in yet another body mold. Becouse otherwise they will re-release ALL evas in that mold yet again.