Salam,
In both verses the Arabic word " " which means "or" it never means "and". There is a much difference. If you read Quran it only allow sexual intercourse with marriage which is supported by Quranic verses 43, 24, 25 and 2432. Therefore, it is a misconception that sexual intercourse with one's slave is permitted without marriage.
It is my interpretation and you don't have to agree with me.
Regards,
NK
No doubt, no woman is permissible except after Nikah. " " is also used as "and/or". Or restricts the choice to either which is not the intended meaning. It is explained in the given link in my earlier post.