Replying to CAST ISO compatibility w different boots

I'm looking at getting a cast setup but may wanna use my inbounds skis. From what I've read ISO5355 (my alpine boots) is compatible with both the WTR and Alpine plates while ISO9523 (touring boots) only works with the WTR plate? Is this right/should I use the CAST system if I don't want a dedicated touring setup but will be switching boots? Don't wanna blow out a knee or something if the dins fd up w the WTR using alpine boots. Seems like itd be fine but just wanna get some other people's opinions/knowledge/experience.

Also send me a PM if you're looking to sell some pivot15/18s or FKS 155.

**This thread was edited on Nov 12th 2020 at 11:19:49am