If it ain't broke don't fix it I say.. The only difference I find from the original ones and the new ones from Aug 5th is Offside Trap was taken off and also the Switch to opposite flanks on the favorite tactic. Also the Counter Version now has a mentality of Balanced instead of Fluid.
But the roles are still the same for everyone. Because of that you won't notice that much of a drop off with the tactic familiarity if you switch.
I was doing good with the other one too, but figured the changes weren't radically that different, so might as well just use new the ones.
My only thing, if any that I have about the tactic is 2 Ball Winning Midfielders, I'm still not sure if I'm a fan of this, more so because of I have James Rodriguez and Ross Berkley (2017/2018 season, so Rodriguez is pretty much in his prime now while Ross is about to go into Prime being just 23) in my team, and it kind of makes Berkley an "OK" player when putting him in the midfield position. I'm tempted to make that role a DLP instead to suit Berkley better, but I don't know if I should tweak the tactic cause I am still winning games, heh.