Apparently Finns have more of something called the "East Baltid" type, and less "Nordid".
without mention DNA studies, i'll speak here of phenotypes:
Finns of Finnland can differ from Scandinavians in the following way:
not more blond people there, but more often very light blond, on the 'ash' side of hue ('platine' 'white blond') - fewer of 'dark honey blond' -
maybe a bit fewer true light eyes as a whole, but more often on the 'grey' side: not the mixed 'grey-green' almost lighteye (mixing where it plays a role) but a milky hyper light blue with a darker blue external ring , all that in a bigger iris than true 'nordic' people - say: when light, lighter than typical Scandinavian for hair and eyes (coupled) -
red hair people are seldom enough, upon all in the more typical zones of Finnish Carelia - Finnland = or < 1% # Norway 1,8% (but some districts to 4%),Sweden 3,3% (ranging from 2% near Finnland) to 5% (South Central), Denmark 2,2% but some district too at 4%) - freckling seldom enough, more scarce in Scandinavia -
the hair is straighter as a whole, rough sometimes, not so often slightly wavy as in Scandinavians -
for skin, I didn't pay too much attention but I red they have also a lighter skin, an without visible blood irrigation that give the 'nordic' people this 'pinky' hue of skin: their Finns skin are very light greyish-yellow white, not so pinky -
more often mesocephalic to sub-brachycephalic indexes of head # Scandinavians more often on the dolichocephalic side / in the mixture, it appeare that even when dolichocephalic, the Finns show often a lateral cranial profile close to the Est-Baltic one (I can't say nothing personally, I red that) -
more fleshy than Scandiavians, longer in chest, shorter in legs - shorter all stature (little difference in West, bigger in Carelia)
shorter broader noses, more often concave than Scandinavians, more often half-shut broad eyelids aperture evocating asiatics but without the mongoloid slit (these eye seams elevating on the open sides) -
more stricking flaring angles of jaws, an broader as a whole, even in proportion of head and facial indexes -
all that is the tendencies that seams linked to the so called Est-Baltic types which isn't very far from the blond borreby brachycephal type of Denmark and Western Norway, but with some accretions that evocate a slight siberian influence -
it's a rough way to generalize things - Scandinavians and Finnland Finns present both a big part of common mixture, but the proportions tend to be inversed for the blond components - (they have equally somme 'brunet' minorities, not always from the same sources) -and Western Finnland is closer to Scandinavia than Carelia or Saami Finns -
less strong tendancy to boldness as Scandinavians