The final decision is really up to the individual and if your were thinking going the cross kitting route to take advantage of the best of both then the DR 32cm rockets will fit the AFV boxes with only minor lateral movement but the AFV 32cm rockets won’t fit the DR boxes.
The AFV support frames would need minor trimming to fit the DR hull as the top opening is slightly less than on the AFV kit and as mentioned there is the 3.7cm Pak option in the DR kit.