Is my burner an oem or retail? confused!

From what i read OEM models (GWA, GMA, GCA, odd numbered 2-digit GSA models) tend to come bundled with PCs sold by various OEMs (e.g. HP). I bought my computer (hp) from a store, but the burner is dvdrrw GSA-H20L.
I’m sort of lost

Why should this be a problem?
Did you open your computer? I’m sure the drive has HP sticker on the top. As far as I know LG changed the naming for the new series of drives so the OEM drives do have the same naming but the are some OEM only models like the GSA-H31L.