It is outside my realm of knowledge, but I presume Britain and France considered recognizing CSA for economic and geopolitical reasons. Not because they felt kinship with a chattel slavery economic system. Every nation on the planet in 1861 was primarily agrarian. But the chattel slave economy of the south was at at level of cruelty not seen anywhere else in Europe or North America. Serfdom was outlawed everywhere in Europe prior to the outbreak of the civil war, and even then, the average Russian serf was not the victim of the wanton cruelty American chattel slaves endured.
And that is why I maintain the chattel slavery of the American South in 1861 really was in a league by itself and had no analog anywhere else in Europe or North America