The characteristics of the 6N1P are closer to the ECC81 or 12AT7 than it is to the ECC88/6DJ8, the only difference being the heater wiring/current. Similarly the 6N2P is the Russian equivalent of the ECC83 or 12AX7. A closer equivalent to the ECC88/6DJ8 is the 6N23P.

Cheers

Ian