Comparison of pre-peak, around peak, and late-time spectra of SN 2018jmt and SN 2019cj with those of other SNe Ibn at similar phases. The H, He I, and O I lines are marked with dashed vertical lines. All spectra have been corrected for the respective redshift and extinction. The pre-peak spectra are shown in green, those taken near the maximum light are in orange, and the post-maximum spectra are in purple. The most significant He I lines are indicated by vertical dashed blue lines, while Balmer lines are marked with red dashed lines. The O Iλ7774 line is represented by a dashed black line.