Short action Long action confusion??

i have 3 savage 220 swifts.
two are long action (both flat tops),
one short action long magazine (round blue receiver, savage 12 stainless barrel)
one of the longs has a short magazine (mcgowen stainless barrel)
the other long has no magazine (solid bottom receiver, savage 112 stainless barrel, blue receiver).

to simplify:
#1 is model 12 stainless barrel round blue short receiver stainless savage fluted barrel
#2 is model 112 single shot blue flat receiver stainless savage fluted barrel no letter in serial #
#3 is model 112 short magazine blue flat receiver mcgowen barrel no letter in serial #

i bought all them used over the last 5-6 yr
i understand the round/flat receivers and the mcgowen barrel
but is everything else just mix/match of whatever??

im not confused bout the long/short actions but
does anyone have any insight as to the why of the different configurations? thanks 1953greg

Savage built every chambering on long actions before they designed the short action. Simple as that.