I would render it rather probable that the tank evolution for german tanks would go and look much different from OTL.
Picturing in your/our mind the PzKw I, II, III, IV and even the prewar developed (later strikken) PzKw V of OTL as we know them would IMHO wrong.
With the for TTL proposed better economical and therefore for the military financial situation the in 1931 - after their thorough testing - ordered
289 "Leichttraktoren" of Rheinmetall would probably NOT be strikken due to finacial reasons of OTL and later replaced by the cheaper PzKw I as we know it. ... maybe the order might be shorten to ... let's say halfed to something about 150 pieces.
Also to be remembered there were imporvements planned and tested from january 1932 onwards due to the lessons learned at Kasan. esp. regarding their suspension.
View attachment 888377 View attachment 888378 and the 'original'
View attachment 888380
In a production model very likely other flaws as i.e. the frontplaced radiator would very likely also be adressed aa well as the switch from rear drive to frant drive.
The general layout ... as we are NOT in Nazi times and at least for the time being the Reichswehr might still have to face some ... men shortage (allowed to recruit) they might - similar as the Israelis with their
Merkava - value the men esp. if trained higher and worth better protection from the front. What might be the foundation of a different design 'tradition' ITTL.
For the first question ... in time they would surely develop some 7,5 cm carrying vehicle as well for said - and in other armys soo important (french
Char B and its predecessors) infantry support.
If derived from some Leichttraktor chassis then with the gun placed at the rear with some 'better' elevation and true artilleristic missions tasked as well. The way for some 10,5 cm - or even larger - howitzers mounted might therefore also even shorter than IOTL.