No, both polls were aligned with the Des Moines Register Polling, the Des Moines Register aligned themselves with both parties doing the polling, hence the / after the words the Des Moines Register/blah, blah.
The difference here (at least that I see) is who aligned afterwards, especially given the quick turnaround to do another poll. The first poll (though I think all polls are miscued in the press, you have to go and see whom all they asked to see that) was more than likely the most accurate reflection....which the establishment quo didn't like as they think Biden has more of a chance to beat Trump than Bernie....so to do damage control they have CNN align themselves through the same process to reflect the results they want to push, that being that Biden is ahead not Bernie. Same thing seen consistently with the 2016 election, the media polls were all bias in Hillary's favor as that was who they wanted everyone to believe could win.
so reading just isn't your specialty then. It literally says monmouth dude
“There’s no denying that this is a good poll for Bernie Sanders. He leads, but it’s not an uncontested lead,” said pollster J. Ann Selzer, president of Selzer & Co., which conducted the poll.
....and you can now see who did the Sanders poll for Des Moines Iowa Register.
.....dudette.