6n3C Russian tubes=6L6?

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I have a new pair...will they replace a 6l6/5881 tube?

[mr coffee]

http://www.sphere.bc.ca/test/tubes.html
http://www.sphere.bc.ca/test/tubes16/reflector-6p3c-tiny.jpg (http://www.sphere.bc.ca/test/tubes16/reflector-6p3c.jpg) 6n3C
Russian Made, Reflector Factory Very popular Beam Power Pentode, new bulk stock, individually tested, closely matched for gm. Often called a 6pi3C, 6P3S, 6N3C or 6n3C, it's awkward to correctly translate the cyrillic character to everybody's satisfaction. We can provide matched pairs for no additional charge. These tubes are a very close sub for the 6L6GT, smooth sounding, well made, have excellent reported audio performance. We have both early and late made tubes. Note that the early ones have an additional mica support at the base of the elements, and slightly lower gm.

All are OTK marked, meaning mil-spec tubes

http://www.sphere.bc.ca/test/tubes10/rus-6pi3c-e-tiny.jpg (http://www.sphere.bc.ca/test/tubes10/rus-6pi3c-e.jpg) 6n3C-e
Russian Made, Reflector Factory Very popular Beam Power Pentode, new bulk stock, individually tested, all over-spec for gm with silver tops. Often called a 6pi3C-E, 6P3S-E or 6n3C-E, it's awkward to correctly translate the cyrillic characters. Can provide matched pairs for no additional charge. These tubes are a very close sub for the higher rated 6L6GC/5881, smooth sounding, very well made.

All are OTK marked, meaning mil-spec tubes

I prefer the 5881's.they seem to handle mo' power and last longer in non corksniffing applications

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Thanks as always Mr. C! You always come through...