I agree that 2014-Thanos was the same as then-current Thanos, because they were the same person. Then-current Thanos at EG beginning was weakened by snapping the IG twice, and previously the only person who managed to land a scratch on him after all the heroes used their extravagant abilities on Titan was Iron Man. When he arrived in Wakanda and just put on the Mind Stone, he could still be reeling from the effect and thus Thor with Stormbreaker used the opportunity to hurt him.

2014-Thanos had similar strength, but with much more fury and determination to wipe out the Avengers and destroy earth because of what he learned was incurred to his future self, which he said himself this time was personal. We didn't get to see that fury in IW because he was living the moment for the first time.

To me I don't view IW and EG as two separate movies, but a two parter movie.

As expected, plots are recycled. Antihero Chinese has beefs with Hero Chinese, after altercation, Hero Chinese goes on to fight the true evil, foreign villain who has little motif and character development other than to appear really antagonistic to Hero Chinese. You can see this premise from Ip Man 1, 2, 3 and Master Z.

Actions to be honest are lackluster compared to previous film, there is no memorable scene. The trailers led audience to believe that this movie would feature Bruce Lee more, but that is definitely not the case.

If you watch this movie, you would notice that Chinese characters in the US military never salute their commanding officers.