* There is no difference to the final crafted item related to the A and B class. A class components are more common, meaning when harvesting a pet it is more likely to get one of these common parts. B class components are rarer, more likely to be obtained from higher level pet harvesting. The trade-off for this is:

A Class - more common parts, lower success rate when crafting about a 40% success rate
B Class - rarer, less common parts, higher rate of crafting success and about a 50% success rate