Question Mixing same GPU's?

Mar 4, 2019
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Hey so I was wondering if you could mix a XFX Radeon RX580 8Gb Edition such has here
https://www.ebay.com/p/XFX-AMD-Radeon-RX-580-8gb-Ethereum-Mining/932751250?iid=132972515641&chn=ps
Sorry I cant find any New Egg or amazon links to this card. This is the card I currently own and I want to mix it with
https://www.newegg.com/Product/Product.aspx?Item=N82E16814150803


I was wondering if theres going to be any issues, they both support CrossfireX which I assume is a cordless way of joining the cards with the research I've done. Correct me if I'm wrong.

My motherboard is an AMD 970 Gaming Edition, a little ancient set up but gets the job done.