I see what you mean, it depends on the model, and it is clearer than I thought in their catalogue.
I'll make a list I think.
Road bar end shifters (all BS prefix)
BS-C11 (ultegra and DA 11s)
BS-A11 (105 11s)
BS-A10B, BS-T10B (4700 10s)
BS-A10, BS-T10 (4600 10s)
BS-A09, BS-T09 (sora 9s)
BS-A08, BS-T08 (shimano 8s)
BS-C11 and BS-A11 shifters ought to have the same cable pull. In some (not all) cases the same models with SL instead of BS prefix are available, in thumbshifter form. All LH shifters in this series appear to be microratchet type and are capable of handling a triple mech as well as a double. If a model has an S suffix option (eg BS-C11S) then it is fitted with shorter shift levers.
Note also there are so called 'transferable' RH shifters in some models, eg SL-T10B and BS-T10B shifters have RH shifters that are switchable between friction and index. Hurrah!
In mountain shifters there are rapidfire type pods as well as these bar end shifters and thumbshifters
BS-M12-R, SL-M12-R (RH shifter for shimano 12s MTB, with Friction mode as well as Index mode).
BS-SR-M12, SL-SR-M12 (for SRAM Eagle 12s, Friction/Index type)
BS-M11, SL-M11 (for shimano 11s MTB RDs)
BS-SR-M11-R, SL-SR-M11-R (for SRAM MTB F/I type)
BS-M10, SL-M10 (for shimano 10s MTB RDs)
in 9s and 8s the same shifters work for road and MTB.
There is also BS-N08 and SL-N08 which are for Nexus/Alfine 8s IGH.
FWIW Sun Race R90 9s bar end shifters look almost identical to BS-A09 Microshift type.
appear to be model BS-A11.