ISBNs are assigned to each edition and every change in book format with the ASIN. This means that the first edition of the book has a different ISBN than the second edition of the same book with the same ASIN. You can visit this website https://www.turbopiranha.com/isbn-to-asin-bulk-conversion-tool/ for arranging products with IDs on bulk conversation tool. 

For this reason, it is important to enter ASIN information every time you update a new book in the tool, because sometimes only the title and author may not contain the exact book you are looking for. ASINs also differ between formats (e.g. hardcover version has a slightly different ASIN from paperback version). 

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The important part of the ISBN is called Group Identifier. In most cases, group IDs are the 4th and 5th digits of the 13-digit ISBN (or 1st and 2nd of the 10-digit ISBN). Group identifiers refer to the language in which this book was published. 

Most books have a single-digit group ID, but group IDs can be between 1 and 5 digits. The publisher code is determined by the ISBN agent to ASIN. Publisher code is distributed in blocks. As soon as the publisher uses all of his distribution and then change it into ASIN, additional blocks are given to him. 

This means that the publisher’s code is not always the same or consistent. Unfortunately, there is no place where you can search for all publisher code to change in ASIN. However, a little creative online search can lead to ASIN informal listings that are quite accurate but incomplete.