Need some explanations regarding error 5461 & 8541

Hi,

I’m trying to understand why I’m receiving 5461 error instead of 8541

Details : I’ve added new products on Amazon (asin are already created by other seller), sometimes I’m receiving 8541 regarding brand, manufacturer, title “The SKU data provided is different from what’s already in the Amazon catalog. The standard_product_id data provided matches ASIN XXXXX, but the following data is different from what’s already in the Amazon catalog: brand (Merchant: ‘xxxx’ / Amazon: ‘yyyy’)”

I change the brand, manufacturer or title and it’s ok

But some other times I’m receiving 5461 “You may not change the brand name on this ASIN. Please use the brand name currently shown on the ASIN detail page.”

What is the difference, why I am receiving 5461 on some asin and 8541 on other ? I’m not asking to update an asin just sell on it

thanks !