I couldn't possibly imagine any difficulties for a Warrior pilot to transition to a 152 or visa-versa. The main difference between the two are fuel management (152 has gravity tank and hence no fuel pump and a simple on/off fuel swtich so no swapping tanks.
However, no 152 checkout is complete until you have unwittingly brained yourself on the pitot
I think it even drew blood
152 1, HWD 0.