different tar balls on different sites

I would like to create an OpenBSD port of libaes (with the goal to link from HDF5 and to give CDO GRIB support).

To this end, I am using two SITES (for redundancy), namely

1. https://gitlab.dkrz.de/k202009/libaec/-/archive/
2. https://github.com/MathisRosenhauer/libaec/releases/download/

The respective tar balls of the same version (v1.1.4/libaec-1.1.4.tar.gz) are different. In (1) there is no configure script included. Should I run autoconf there first? In (2) there is already a configure script.

Is it intended like this?