Let's help a Proka a little. Camouflage version of Lazar is older version Lazar 1, the completely green version is Lazar 2. Both are prototypes. Lazar 1 have stiff, truck suspension, and Lazar 2 have independent suspension. Lazar 1 have 20 mm gun, and Lazar 2 have 30 mm gun+50 cal MG+ 2 AT missiles. Lazar 2 have bigger slope on front and have no windows. But any future buyers have options of modifying things, so you can put any battle station you like. Patria cost around 2M$ so Lazar 2 should be around 1M$.
We are developing several SP Artillery system by same kitchen, so they are look similar. NORA B52 have 155 or 152 mm 52 caliber gun. Finished version had ammo stored left and right from gun, and having auto loader. It is quite possible that they added some extra armor on it. And that gun can look quite differently in suppose on which side is turned. SORA have D30 122mm howitzer on truck. First prototype have no auto loader, so on this Partner we will see second prototype with auto loader. There is also SPG named SOKO, with 105mm gun who looks similar. By end of weeks we should have more and better pictures, because Partner 2013 is closed for civilians until Friday.