My query to you wasn't about format at all.
I read your post again and it had highlighted text 12345678910 in 4 places, saying this is your CST/ VAT number which you wanted to compare.
My question was, will it always have a constant number of digits (10/11)? In your original post, there was no mention of such a length, and that's why I wanted clarification. In your reply also, you haven't provided an answer to my question.
Hence, please read my question again and then provide a confirmation.
Thanks,
Juwin