VIM3L vs VIM3 NPU nb model size and differences in inference

Hi, I converted my model to NPU on VIM3 and VIM3L using two different optimize PID in ovxgenerator , all other the same. As far as I understand it converts fp32 weights of model to int8, so the model size on VIM3 is 4 times less. But on VIM3L it produces even smaller file.

You can see it here 35.5Mb 18.5Mb. Does it mean that VIM3L run on int4 or prune some weights?