Comparison between observed spectra of AzV 210 (B1.5 Ia) vs. AzV 472 (B1.5 Ia), and AzV 22 (B3 Ia) vs. Sk 179 (B3 II). For the comparison between the B1.5 stars, their optical and photospheric spectra are very similar to each other, but their wind lines at the UV and Hα are considerably different, despite the similar luminosity and temperature. In the juxtaposition between B3 and B8, the profiles in their UV are similar, while their optical spectra differ, especially due to broadening and different surface gravities. In each comparison, we list the old and the updated spectral types (Crowther, priv. comm.).