I've been a fan of Paizo's paper minis. Ever since I printed out the first batch, I noticed that they follow the 28mm scale for miniatures - i.e. in most paper minis representing adult humanoids, the distance from the feet to the eyes is about 28mm.
The 28mm scale is consistent with the Pathfinder tactical grid (5 feet to the inch = 1:60 scale), DnD5e materials, and most plastic/metal miniatures (e.g. Reaper minis), 3D-printed dungeon tiles and furniture that I'm aware of.
(By contrast, GURPS hex grids use a scale of one yard to the inch or ≈1:36.5 or ≈46mm from feet to eyes)
Recently, I've got access to the Starfinder beginner box, which features Paizo's cardboard pawns. To my surprise, the cardboard pawns follow a different (bigger) scale, which seems to be 40mm from feet to eyes on a 28mm-wide base:
Even when the size of the bases are the same (25mm diameter), they look obviously different.
This poses a few questions in my mind:
Do the cardboard pawns from Paizo follow a known, consistent scale?
As a GM, how can I minimize the visual clash when mixing 25/28mm-scale minis and bigger-scale cardboard pawns?