Took some comparison pictures to accompany my additional thoughts/ observations before returning the replica keyboard.
Major observation: didn't occur to me to check the backlit functionality that was advertised while I was appalled with general fit and finish. The received replica keyboard was *NOT* backlit. Only capable of toggling thinklight. Despite a listing and label sticker on the backside stating otherwise! At the same time, the material is different. appears to be top-printed textured solid-color ABS vs. the color-blocked painted clear ABS of the genuine backlit keyboard.
Packaging - No mention of Lenovo or a Lenovo part number on the SKU and generic die-cut cardboard box:
Overview - Note no reflective backing on the replica @ bottom as seen on genuine @ top and crudely stamped trackpoint module housing:

(Thinner cable due to lack of backlight in the replica despite labeling and ebay listing)
High res:
https://i.imgur.com/9AUsJeG.jpg
Stickers (likely forged/ copied in verbatim off genuine) - Bottom sticker blatantly states model as "backlit" when it egregiously is not.

High res:
https://i.imgur.com/39LeCLu.jpg
Comparison w/ genuine - was listed on ebay as a "direct compatible part #"

High res:
https://i.imgur.com/GDJS1gw.jpg
Trackpoint cap - crudely molded and manually "cut" to fit significantly shallower trackpoint interface on replica. I believe the trackpoint module on the replica is based on the trackpoint modules on X1 models that take shallow trackpoint caps. A classic trackpoint cap interface was chosen likely due to readily available classic caps vs. the newer shallow X1 style caps.

High res:
https://i.imgur.com/go0iw6Z.jpg
Trackpoint mouse buttoms - inferior cost-cutting measures in molding sacrificing "crisp" mouse clicks for mushy ones and buttons that sit higher; possibly touching screen with lid closed. Besides a disparity in molding precision favoring genuine, genuine buttons are doubleshot ABS vs completely top-printed on the replica. The rubberdome of the genuine despite years of heavy use by myself is still very robust and flexible. Rubberdome of replica is very thin and mushy already despite being recent production.

High res:
https://i.imgur.com/l13G4Wl.jpg
https://i.imgur.com/XtIF3sz.jpg
Rubberdome mechanism (1u) - different

High res:
https://i.imgur.com/x3y3eeD.jpg
Rubberdome mechanism (1u+) - different

High res:
https://i.imgur.com/NiO7cv8.jpg