I received a 2020 K-1 for my limited partnership in March 2021. Last month I received a second (very different) K-1 for the same partnership, not amended. What do I do?

The 2nd K-1 came from a different accountant.  He said he didn't know about the first K-1.  I'm reluctant to amend my 2020 taxes since I do not know which K-1 is correct.  Nor do I know whether the IRS in fact received a copy of the first K-1.