Despite the fact that these specific mobs DO allow for separate left and right body part textures, for some reason in the .png file there now are identical textures.
This wasn't an issue with Zombie Pigmen in 1.15.2, back then the separate left/right parts were not identical, but mirrored.
For the Zombified Piglin this results in it having:
identical left and right arms (see red circles in attachment)
identical left and right legs (see blue circles)
the loincloth texture is "split" from the half (see white rectangle)
For the Piglin:
identical left and right arms (see top green circles)
identical left and right legs (see bottom green circle)
left and right ears do not match
This looks like an oversight when creating the new texture.
EDIT: Added the texture file itself too to illustrate better what is causing the identical textures
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I was requested to add more info, so I actually decided to try and fix the texture to see how I believe it should look like.
You will even see that after the mirroring edit of the limbs that the the left leg will match with the tunic of the body. Same thing for zombified piglin.
[media][media]

This should be reopened

I don't see how this can be intended, the flipped textures that OP provided make it pretty clear that the textures connect seamlessly and are supposed to be that way, especially since for the Zombified Piglin, that's how they were back when they were still Zombie Pigmen. How they are now looks very one-sided and strange. In 20w18a.

Could you make a download for that texture pack?


Thankyou!

I stand by my statement from last week, still in 20w19a
This hasn't been fully fixed in 20w22a. Only the zombified piglin's second layers have been changed.

Loincloth has been fixed.
Ears, legs and arms not.
Could you please create a new ticket for that then? Just so that it's clear when what was fixed.

Has a separate report for the arms and legs been made yet? If not I can do it.

Well, yes MC-188318
But It needs your comment!

The Nether Update is close for release and the arms and legs still need to be fixed.
Is it gonna be reopened? Or a new ticket to be made?

I think this needs to be reopened

Alright! Can a mod reopen the issue because the bug wasn't fully fixed?
The left arms and legs are still identical to their right ones after 20w22a came out and here's a picture to show that it hasn't been fully fixed.