Chelsea is called an unstable team we can see it from the start of the season well, in the last 2 matches they played well but we can't guarantee that they can do it again in the next match somehow, when we hope they win, the opposite happens lol. I can't guess about the upcoming Chelsea match because both teams are at the same level Chelsea has the advantage of being a on fire team and Newcastle of course as the home team also has an advantage so I think the chances are 50:50.
In the early of the season, Chelsea performance was very unstable. But in the last few matches, it looks better. Sure, the positive signs of the current matches won't guarantee the winning for the next matches. However, we can expect that Chelsea will have a higher chance to win the next matches with their current good condition. For the upcoming match, it is surely not easy because they will play against Newcastle. We know Newcastle is one of the strong teams in EPL this season. Yes, I agree that Chelsea and Newcastle are almost the same level. The result of the match will be difficult to predict, but I believe Chelsea can win the match because their squad seems more ready for the match.