Fingering is mostly identical for both, the chalumeau- and the clarinet-register, and almost identical, too, for all different sizes of clarinets, from the smallest Eb to the counterbase clarinet. The fingering tables are usually applicable for all sizes. That means that you can in principle play on every clarinet you like (that is if you stay with your system - there are differences between Boehm and German Oehler, off course).