Maddow had a great segment on the Ryan Goodman piece in Just Security detailing Barr's intentional deception when he hid a legal memo which essentially gave the US gov't a permission slip to seize foreign targets without violating international law.
Barr lied and stonewalled before Congress much like he has during his confirmation hearing and recent appearances on the Hill. He used the same language to describe his memo 'summary of principal conclusions'. He likes that turn of phrase. It's a bit like mental masturbation for him. He successfully stonewalled on the matter until the Clinton Administration came in. Congress, however, was very delayed in issuing subpoenas.
Goodman believes this proves that Barr won't care about lying at will now on the expectation that stuff won't be found out until a new administration is in power and he is long gone.
The big differences between then and now are: 1. social media to keep the matter alive in the public consciousness, 2. crowd sourcing of the legal community's views on cable tv/twitter, 3. Mueller/OSC attorneys beginning to leak, 4. the mercurial Rosenstein, who might make a move to preserve himself and throw Barr under the bus, 5. subpoenas from Nadler ready to fly, 6. open skepticism of Barr expressed by the judiciary, 7. the lack of public support for Trump's spin, 8. the quick erosion of Barr's credibility and therefore value to Trump.
If I were to add another point, there is an apparent desire among Congressional GOPers to get it all out there, either because they don't want to spend too much political capital covering for Trump, or because they feel they can pick and choose pieces of information to mount a defense for Trump so that the matter dips out of the public discussion sooner before the 2020 election cycle kicks into high gear. They are also betting that the Dems won't want to go all in on impeachment so if it's out there, it's easier to deal with than if Trump keeps covering things up. The Dems are getting all of Trump's financial stuff anyway through subpoena and are likely to get the Mueller Report as well. If you're a GOPer, would you rather have that stuff come out now, or in January as the Dems enter their primary cycle and can amplify what a crook Trump is? Seems logical for the GOP to want to get it out there now if they believe it's coming out eventually.
[Note: In a normal world, I'd say that the GOPers would want to get it out there now so that they could determine whether to jump ship on Trump and reserve enough time to regroup for 2020, but let's not kid ourselves].