Let's flip it the other way round, which Barcelona players do you think would make Bayern's team?
What is your exact question here? The Bayern team in the best of its form in Heynckess glory days? If so, that team doesn't exist anymore. Or do you mean the Bayern team Pep had, which was unquestionably top 3 in Europe? If so, again, that team is no more.
If you are as strict in your assessment of CURRENT Bayern, here are the Barca players who would make it:
Ter Stegen (at the moment, since Neuer is injured)
Semedo over Rafinha
Umtiti over Sule (or semi-crock Javi Martinez, whichever you prefer)
Pique and Hummels are just about the same level
Alba over Kimmich
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Summary for defense+gk. Today, 3 Barca players would walk into Bayern's d+gk positions, Semedo, Umtiti and Ter Stegen quite clearly. Pique and Hummels are at the same level, Alba/Semedo IMO are both better than Kimmich too, but let's call these a draw. The actual comparison should be Semedo-Kimmich and Alba-Rafinha. I'd pick Barca pair no question.
Midfield:
Rudy-Busquets ===>No contest here, Busi.
Mueller-Iniesta - Even if you think Iniesta is past it, you have to be out of your mind if you think the current Mueller is clearly better here. He has been in and out of the team having a hard time getting playing time. But OK, I will call it a draw.
Tolisso-Rakitic ===> Rakitic has an edge here.
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Summary for midfield. Even if you pick Thiago over Tolisso, the midfield is largely even. In the match-ups, if there is a glaring advantage, it is Busi over whoever Bayern have. I'd say Thiago is better than Rakitic or Iniesta in theory, but realistically, he hasn't shown any consistency to be sure of it. Even Bayern fans aren't sure if they prefer Thiago over Mueller there.
Attack:
Coman-Dembele ===> Dembele. But Dembele is injured so Coman-Delufeu ==> Coman
James - Messi -> Messi
Lewandowski-Suarez ==>Right now, Lewandowski
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Summary, with the recent injury to Dembele, a slight edge in attack is to Bayern.
Overall, it's about par, with certain position match-ups being VERY Barca favored. For example, Semedo, Busi, Messi etc. are far better than their Bayern counterparts. Others are about the same quality. Conversely, if you asked which Bayern player would walk into Barca lineup, I have only 2 very clear ones, and they are Neuer (if fit and in best form, which he isn't) and Lewandowski (unless Suarez comes back to form).
Do you see light years difference here?