yup, the 5.45 is very similar to the 5.56 cartridge.....so the mags will have a similar curve to AR mags
AR vs AK74 mag
View attachment 7676719
the 7.62 round is fatter and more tapered, resulting in more of a curved mag.
AR vs AK47 mag
View attachment 7676720
so if the mag looks like an AR mag, its likely a 74 mag
....or it could be a galil mag....