Subject: Did finding of dark matter in galaxy cluster collision mean dark energy

We appeared to have found dark matter in galaxy cluster collision, it appears 
to be that it is dark matter not modifying gravity is what is there, however 
does it mean that dark energy must exist, or we might still need to modify some 
laws of physics, since does the existence of Dark matter say anything about 
whether dark energy should exist, or one has nothing to do with the other?

Re: Did finding of dark matter in galaxy cluster collision mean dark energy