Discussion on difference in recoil between pps42 and pps43

after lengthy private discussion with @FurinaDeFontaine_1 about difference in recoil between SINGLE SHOT RECOIL between pps42 and pps43 we have come to an impasse, so i want to hear opinions of third party and maybe if someone can present evidence to either claim.

@FurinaDeFontaine_1 claims that devs accurately portrayed recoil of the gun and that difference between single shot recoil is cause of 30mm shorter barrel and difference in gun design

i on other hand claim that devs made up those values and that there is absolutely no reason for such drastic SINGLE SHOT RECOIL difference between pps42 and pps43 to exist considering that they are:

  1. firing same cartridge
  2. pps43 has slightly higher mass than pps42 (~3% higher mass)
  3. they are ergonomically very similar so their recoil distribution should be approximately the same.
  4. pps43 has smaller barrel so it should have slightly lower muzzle velocity (~6m/s or ~1% difference).

ingame values for recoil
pps42
actual vertical recoil: 8
actual horizontal recoil: 3

pps43
actual vertical recoil: 12
actual horizontal recoil: 4

weapon specifications
image

wiki list on differences

PPS-43 (ППС обр.1943 г.) Towards the middle of 1943 the modernized PPS-43 entered production; efforts were made to improve manufacturing and safety.[1] The ventilated heat shield was integrated with the upper receiver cover, both the barrel and shoulder stock were shortened, the stock’s locking mechanism was simplified, the casing ejector was moved to the head of the recoil spring guide rod, the magazine well angle was increased in the receiver in order to enhance feeding reliability and the safety was improved to block the trigger and lock the bolt in either the open or closed positions.[1] PPS-43s were seldom captured by the Germans, unlike the PPS-42, as the Red Army was no longer on the defensive in 1943.