Indeed, the two clubs have a great chance to remain in the top 4 zone of the EPL standings as long as they can maintain consistency in every game, but I think Newcastle and Man United are still in good form which continues to improve from time to time.
Newcastle's current condition is like they have rediscovered the rhythm that was a little lost for the middle of the season. After they lost to Manchester City, the next 4 matches they always get full points and this is obviously very good for them.
Now they just need to maintain consistency like this because indeed looking at the upcoming matches it will actually still be a bit inconvenient because Brentford also sometimes always surprises but for the current position in the top 4 it looks like they are a little comfortable because their competitors are only Manchester United and Tottenham but for Manchester United, Newcastle are still quite good in terms of goal productivity and for Tottenham it is clear that the remaining 1 match of Newcastle can still be used as one of the reasons they are able to survive at this time especially Tottenham are also 3 points behind.