The officially published world is consistent. The Hobbit was even slight modified to be consistent with LOTR. However, all the drafts Christopher Tolkien is us

The officially published world is consistent. The Hobbit was even slight modified to be consistent with LOTR. However, all the drafts Christopher Tolkien is using have been written at various times, they were rewritten multiple times while the overall world evolved so they are not canon or consistent. What Christopher Tolkien is mostly doing is "adapting" these drafts into the final canon of the Silmarillion.