Engine died down at high RPM.

[mushman]

We had some nasty weather here today so I didn't get to anything, but I did pass by a marine store today and picked up a new set of plug wires, which I was planning to replace since last year.
The wires he gave me were gray and have Ht on them, the originals were black and say copper core on them.
According to the johnson site they list a different part# than the ones I got.
Will the ones I picked up be o.k., or should I return them and look for the specific part#?.