I haven't found the match schedule in the Champions League but if what you say is true then it is a shame, I don't know why I get annoyed when strong teams fight each other in the early stages I mean it would be better if we watch it in the middle or at the end. But yeah now UCL with new system even though they beat each other there is still a chance to qualify if they collect points from other matches.
Talking about Chelsea at the moment they are a different team from previous seasons or we can call it on the same level as Barcelona. On the other hand, Chelsea is always underestimated when playing against Barcelona but in the end they are always luckier so I think both teams have the same chance.
I don't really think Chelsea have the same chances of beating Barcelona, Barcelona have more chances than them, firstly Barcelona they have a better squad than Chelsea and also Barcelona performance from last season and this ongoing season is better than Chelsea own, I known so many Chelsea fans will be thinking because they PSG tey can beat Barcelona is a lie, Barcelona is a team that don't jokes with matches like this, is not that am trying to say that Chelsea cannot win or play Barcelona a draw in that game but you saying that they have equal chance in the game is not right because Barcelona have more chance of winning in that match than them.
I am very sure of Chelsea qualifications to the next stage of the competitions because they really don't have though team to play except from Barcelona and Bayern Munich, Napoli and may be Benfica who gave them tough time during the Club World Cup.