Depends. Between X6 and Omega, we have both a bustershot and Z-saber to account for that are somewhat canonically different from how Zero was in X6.
Beside obvious image retcon, a post seal change should not be left out of the equation.
Right. Because one cannot possibly study the Sigma Virus without updating the host's armor as fashion dictates. X6's ending was made with the full knowledge that MMZ was on the way, they could have cleared everything, or done a shadowy silhouette for Zero, either one would have settled the matter and at the same time made things clearer for the dingbats who don't understand the concept of a sneak peek (which I admit is easy to miss first-time, but viewing it now in retrospect a lot of folks still don't put it together). They didn't.
The Z-Buster is not seen in the X6 ending, so the Buster Shot point is irrelevant. It's never seen when Zero isn't using it, despite concept art showing that it should be stored on his back. Omega's Z-Saber does not function with alternate modes as Zero's does (and even if it did, there's X7's alternate weapons to consider), so the double-ended point is moot. That leaves only chargeability and blade color, neither of which need to result in a visible change in the hilt (otherwise Shadow Armor has some 'splainin to do).
I know leg holsters are a frequent point of contention, but the reality is that both X and Zero series designs are symmetrical in their Z-Saber holds. We just only ever saw one Z-Saber over the course of the X-series, but there's no difference between the left and right sides of Zero's "backpack".
If there was an armor redesign it is current only with Elf Wars and then left untouched the following century. The fact that Inti considered and rejected the old Zero design for Omega says something, as well. They had to make new sprites for him anyway, so there's no real reason not to.
So, both Capcom and Inti had the chance to establish a canon armor change, and neither did. X6's ending can't be dismissed as retconned out unless something exists to retcon it. At current, nothing does. And Inti had the chance to go there and refused.
Also, Vile's Incident isn't Physis. Splitting hairs.
Splitting hairs indeed. It was included with Physis. If I ever refer to the "ZXA Tunes mouse pad", I don't think anyone would believe that a mouse pad was somehow stored on a CD.
But the fact remains that X's armor is designed the way it is, because the timeline is closer to the ZERO-series. That tells us there are somewhat canon changes between X and ZERO. Between X's armor and the ZERO-series, the biggest similarities lie with the style of legs.
If by "closer" you mean some developer thought XCM actually was the Zero-series timeframe, from what you told me in AIM (feel free to get me an actual source/quote if you find it). Developer confusion =/= canon, otherwise the remaining three Guardians are still kicking. It could be the beginning, but such an instance needs further building in order to be validated, or else it means nothing.
Canon changes DID happen in arsenal. The Z-Saber was enhanced, the Buster Shot was picked up at some point. Body design is another matter.