16bdp4 as a sub for a 16bnp4?

[pendulum]

I've been looking around still for a 16bnp4 for my portable airline set to replace the weak tube it has, but it seems this is a pretty obscure tube. On another forum a member suggested the tube 16bdp4 may work. I looked over the two and the characteristics are pretty darn close. The only real major difference I noticed is that the neck length of the 16bdp4 is shorter than the 16bnp4 by a little bit. Can anyone with more knowledge on subbing crts look over the data sheets for the two and let me know if this would work or not? Thanks so much for the help and here are the links to the crt data sheets

16bnp4:
http://frank.pocnet.net/sheets/201/1/16BNP4.pdf

16bdp4:
http://frank.pocnet.net/sheets/201/1/16AYP4.pdf