Both "dichroic" and interference filters are constructed of multi-layers, the both function as interference coatings. A "dichroic" filter reflects a certain band (say the NIR region) and transmits another (say the desired UV band). A narrow band pass filter constructed only using interference filtes can be fabricated that passes any UV band desired, but will require a hundred layers. Selectively absorbing glasses such as offered by Schott (UG-11, for example) make the job easire since they absorb all visible and most of the near IR.
The Baader (and similar UV-transmitting filters) use a selectively absorbing glass to define the UV pass band and a stack of interference filters to help reject the Near Ir where the color filter glass has a leak. This interference filter type is called a 'short wave pass' (SWP) filter. There is essentially no angle dependence becase the UV passband is determined by the absorbing glass, and its passband does not shift with angle unless one goes to extreme incident angles like 60 degrees (half-angle). The cut-off edge of the SWP interference filter will shift shortward at larger incidence angles ... field angles. However it will not encroach on the UV band. If the designer is smart, it also will not shift to wavleenghts thet the glass leaks.
So there is no performance difference for the same filter design whether its size is 2 inches, 67mm or 77 mm (or 140 mm !). The difference is cost. That's a major reason that why my proposed filter will br more expensive.
Hope this helps,