Generally, Swedish Mausers come in four varieties
M94 carbines (handy little carbine with ~18" barrel)
M96 rifles (traditional old-world rifle, ~29" barrel, straight bolt)
M96/38, Short rifle 24" barrel, converted from M96 rifles, straight bolt
M38 Short rifle, new construction from 1938-1944, turned down bolt.
There are others, like the M41 sniper rifle, but most of of the rifles you will see are the above. The M94 is the least common/most expensive, the short rifles tend to be less common than the long rifles.
The Swedes didn't differentiate between the converted or newly produced M38s, but a lot of collectors call them 96/38 to tell the conversions from the new rifles.
The M96 like a lot of other rifles from the era, the shortest sight setting is 300 Meters and the sights were calibrated for the 160 gr RN projectile. With the later 139 gr Spitzer the zero will be 350- 400 meters. Many rifles had a conversion plate for the zero with the newer bullets.
The purpose built M38 carbines had sights for the Spitzer (Torped) bullet, M96 rifles converted to carbines could either have the old sights for the round nose, or two different variants of sights for the spitzer load. These were set for 100 or 150 M depending on version.
There is a lot of information here, including how to decode the brass disk.
http://www.gotavapen.se/gota/artiklar/rifles_se/faq_se_rifles.htm
And
http://www.gotavapen.se/gota/artiklar/rifles_se/rifles_se.htm
Wikipedia also has a lot of information.
https://en.wikipedia.org/wiki/Swedish_Mauser