Tubes in a Cary V-12R

I just bought a set of 6L6GC output tubes for my V-12R. It has always had EL 34s in it. I just wanted to try something new. It may be a stupid question, but...is it ok that the 6L6GC tubes have 6 pins instead of 8 pins? (pins 1 and 6 are missing) I don't wish to damage the amp, of course. The manual and vender both say 6L6GC tubes will work in the V-12R, but I need to know for sure that the pin difference is without consequence.

Thanks in advance.