Will a Mullard ECC34 Substitute Safely for a ECC32

I have an Almarro 318B SET amp that uses one 6SL7 and one 6SN7 in its pre-stage. I have read that a Mullard ECC34 is a ECC32 (6SN7) with a different impedance. I noticed that the specs for the ECC34 are quit a bit different than a ECC32 or 6SN7.

My question then is, will a Mullard ECC34 work safely in my amp, since a 6SN7 is called for? Does anyone have experience with substituting a 6SN6 with an ECC34?