[KanColle] Is the light arm yamato kai the same as the heavy arm

Hey guys wanted to ask if the light arms yamato kai is the same as the heavy arms yamato kai, as i couldnt get any info the if the torso on the light arms is able to seperate like the heavy arms version.

I asked gsc about this as well and they mentioned that it wasnt without detailing what was the difference, please help

Thank you