Are there lithographic differences among the T206 backs, T-213's, etc.?

[Pythonfactory]

Hi all. Sorry if this topic has already been visited. There was a recent comment in the June Pickups thread about how, in this person's opinion, T213's colors tended to be more vibrant than T206. This got me thinking. Were there differences in how T206 (and each of its backs), T213, etc. were printed? In general, do any of these sets have "better images" (e.g., brightness of colors, accurately overlaid colors, quality of ink)?

The only printing difference that I know of is that some of the Coupon sets (can't recall which ones right now) had a different gloss that often leads to creases.

Obviously, any of this would be a generalization. Even if one set were to generally have "better images", there would be countless individual cards that do not fit the mold.

As always, thanks for your insight.