Hi Rey,
Thank you for raising this to us. This is an interesting concern. The afma-sdk-a-v15301000.15301000.0 version translates to the 18.1.1 version of the SDK as per our investigation; however, there doesn't seem to be a clear pattern on the mapping between the afma and the SDK versions. I'll bring up your concern to the rest of the team for their insights on this, then get back to you the soonest possible.
Regards,
Mark Albios
Mobile Ads SDK Team