The phrase "same ref" is a shortened form of "same reference" or "same referee." It means that two or more people are talking about or referring to the same thing or person. Full definition
This is the same ref from the Monaco second leg disaster and I hope we never have to deal with this diva of a referee again. (sbnation.com)
He's been doing that all season and now sent off twice by the same ref that sent him off last time. (justarsenal.com)
Now while I would not usually mind us not getting the penalty, when the same ref then gives an even softer one against us after Richarlison just runs into Bellerin and throws himself to the ground, I have to wonder what Wenger and Arsenal have done to deserve this unrelenting bad luck. (justarsenal.com)