An A Grade Golem Core was completely different from a C Grade Golem Core.
The grades of the golem core were especially important.
After all, they decided what grade the golem created could reach.
While there were other deciding factors on what grade a golem would become, the most important factor was the grade of the core.
If the grade of the core was too lacking, then there was no way for the golem to be strong.
Only if the grade of the core was at the level that was needed would a strong golem be created.
So that meant that this A Grade Golem Core meant that there was the chance for an A Rank Golem to be created. But of course, it wasn't as if the golem core alone was all that decided whether an A Rank Golem would be created or not.
There were also other deciding factors such as the materials used and the power of the one that created the golem.