In general, Anerys have a lighter ground color than Charcoals, and Anerys are generally higher contrast between ground/saddle colors than Charcoals.
However, both morphs vary, and the variation overlaps enough that it is unwise to depend on a visual identification.
Anerys are more common than Charcoals, so odds are that you have anerys. Again, this is a generality, so don't count on it.
The biggest questions are:
1- who/where did you get them from?
2- how were they labeled?
If it is possible to contact the breeder who produced them, that is the best chance you have of a reliable ID, short of breeding trials.