There are indeed changes…

https://twitter.com/starwarsviscomp/status/1194160489825284097?s=21

^ links to doubleofive’s superb ‘Star Wars Visual Comparisons’ twitter page

Edit - a link to the changed Greedo scene on a larger sized screen:-

crissrudd4554 said:

Well we got a new contender! Greedo’s LAST WORD!

https://streamable.com/nit5m

Double Edit - a link to a couple of ‘frame comparison’ scenes highlighting the colour changes:-

Han Solo IRL said:

Quick comparison with what I have on my hdd:

http://www.framecompare.com/screenshotcomparison/DYLWWNNX

edit:
http://www.framecompare.com/screenshotcomparison/DYLWGNNX