JJ-E34L versus EL-34 tubes

Hello Friends...

Thanks to an a very nice folk, named Todd Richards, from which I acquired; for be use with my recently Gifted Dynaco by Panor from 1991 Series 2 power a quad perfectly matched JJ-E34L tubes made in Slovac Republic. I drop a letter to the factory, and from their respond me, that my acquired E-34L tubes have "Near 15% more Power"..., that the regular one EL-34 tube.

My enquire is this.. If?, this 15% more powerful tube, may cause any Harm or Defect in my Dynaco unit?

Any, erudite response will be greatly welcome!

Thanks very much for reading my letter, and for your noble help on my matter.

ALEX!