Will load balancing work with WAN links provided by the same ISP and potential reside in the same IP subnet.
Yes , It works perfectly by Peplink.
Two of my WAN’s are the same ISP with same subnet. No problems.
have some that works fine here too. It might of been an issue a long time ago on older firmwares. There used to be page in the knowledge base concerning this, but its no longer the case.