most line dont matter which k-1 becuase they are not business items so you can put th amounts on the ET K-1
here are the boxes where it doesn't matter:
5 (interest income) ,6a(dividend income) ,6b Qualified dividends),9a Long-term capital gain 13A (cash contributions), 13H (investment interest expense), 13K Excess business interest expense - good luck with this because TurboTax does not handle this item nor the form. If the partnership reports EBIE to the partner, the partner is required to file Form 8990. See the Instructions for Form 8990 for additional information.
For tax years beginning after 2017, the partner’s basis in its partnership interest at the end of the tax year is reduced (but not below zero) by the amount of excess business interest allocated to the partner for the tax year, even if the partner isn't allowed a deduction for the allocated excess business interest in the year of the basis reduction. If the partner disposes of a partnership interest in which the basis has been reduced before all of the allocated excess business interest was used, the partner increases its basis immediately before the sale for the amount not yet deducted.
13C (nondeductible expenses), 19A (distributions)
since each is treated as a separate entity you are entitled to a QBI deduction for the SUN's QBI (20% of 36)
nothing for USAC since no QBI, Nothing for ET since a loss.
