There are alot of different types of tapeworms. You can't expect anyone, even the vet(besides a parasitologist), to know which tapeworm it is. They are all treated the same though, with praziquantel, and the vet will be able to prescribe deworming medication for your snakes.

When doing fecals for hours at a time.. You get an eye for it. But still.. Sometimes it's incredibly hard to determine whether that TEENSY coccidia oocyst is actually a cryptosporidium oocyst.. There are also alot of different types of roundworms, hookworms, and other parasites that can easily be confused with one another.

I would trust your vet. They know what they are doing.