Won't T-38 be rather PzKpfw-38(t)? Eh, stupid idea, sorry, most likely not for confusion with T-38 amphibious tank... In time Hetzers got into Russian hands there weren't any T-38's left, though, so there was nothing in the way of using that name...
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You has right so you find a bug in my book about Polish People Army LWP here was a part about captured vehicles used by this units some captured from germans some take from rusian field repair plants. See LWP OOB units 050 to 055 in this OOB the labes are taken from this book . Stug should be replaced to SU-75 (is T3 meaby because stug is on PZIII chasis) PZkw IV to T4J (meaby rusian use alfabetical numeration). Hatzer is bug was T-38 meaby because was on Pzkw38t chasis what should be here i don't know. Stayer RSO and and both Sdkfz designations are unknow in book was only german.
I have idea meaby SU-38 designation was use for Hatzer that was self propered gun but that is only my idea no historical suorces