Universal Geneve 870.370 Movement

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After some researching, I'm realizing that I can't really distinguish between a 1990's 870.370 and a post 2000's 870.370.

I know the pre 2000's one have a pretty modified ETA 2892, but the post 2000's have a ETA 2824-A2.

Did the post 2000's have any markings or decorations on the rotor or is it literally an off the shelf 2824? Does anyone have any reference photos of a post and pre 2000's side by side? Specifically the movement. TYIA! (First post so bare with me 😀)
 
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also does anyone have a guess as to around which year a serial 4,1XX,XXX would sit?