Different jig altogether. The bat jig is very compact and uses a size #6 hook. If the eye isn't important then the round head with wire keeper would work better than the Bat jig depending on your needs. The Bat jig isn't a round head, it has a conical shape to it and it uses a 35 degree hook, that difference is a big one as it dictates how you are presenting a lure or bait. As I said, it depends on what you need the jig to do but in my opinion the Bat jig isn't a substitute for a ball jig at all and you can use the round head jig with wire keeper if the large eye isn't important to you.